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Salma Alam-Naylor
@whitep4nth3r
THIS BOX WILL
CHANGE YOUR LIFE.
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@whitep4nth3r
https://whitep4nth3r.com
HI FRIENDS,
I’M SALMA.
I help developers build stuff,
learn things, and love what they do.
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WHAT IS
CSS?
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Cascading Style Sheet
CSS
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Cascade
CSS
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Specificity
CSS
Cascade
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CSS
Specificity
Cascade
Inheritance
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CSS
Specificity
Cascade
Inheritance
An algorithm that defines how to combine CSS property values
from different sources.
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CSS
Specificity
Cascade
Inheritance
How browsers decide which CSS property values are the
most relevant to an element and, therefore, will be applied.
An algorithm that defines how to combine CSS property values
from different sources.
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CSS
Specificity
Cascade
Inheritance
Default > parent > child.
An algorithm that defines how to combine CSS property values
originating from different sources.
How browsers decide which CSS property values are the
most relevant to an element and, therefore, will be applied.
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CSS
Inheritance
Default > parent > child.
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CSS
YOU
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YOU
CSS
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//* HTML **/
<
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//* HTML **/
<
//* CSS **/
.container {
max-width: 640px;
margin: auto;
border: 10px solid red;
}
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//* HTML **/
<
//* CSS **/
.container {
max-width: 640px;
margin: auto;
border: 10px solid red;
}
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//* HTML **/
<
//* CSS **/
.container {
max-width: 640px;
margin: auto;
border: 10px solid red;
}
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//* HTML **/
<
//* CSS **/
.container {
max-width: 640px;
margin: auto;
border: 10px solid red;
}
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//* HTML **/
<
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//* HTML **/
//* CSS **/
.box {
background: yellow;
border: 10px solid blue;
}
<
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//* HTML **/
//* CSS **/
.box {
background: yellow;
border: 10px solid blue;
}
<
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//* HTML **/
//* CSS **/
.box {
background: yellow;
border: 10px solid blue;
}
<
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//* HTML **/
//* CSS **/
.box {
background: yellow;
border: 10px solid blue;
padding: 20px;
}
<
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//* HTML **/
<
This is a box.<
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//* HTML **/
<
This is a box.<
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//* CSS **/
.box {
background: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
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//* CSS **/
.box {
background: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
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No content
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//* CSS **/
.box {
background: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
box-sizing: border-box;
}
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//* CSS **/
.box {
background: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
box-sizing: border-box;
}
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The CSS Box Model
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The CSS Box Model
will change your life.
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WHAT IS THE
CSS BOX MODEL?
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DESIGN & LAYOUT
CSS BOX MODEL
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CONTENT
CSS BOX MODEL
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PADDING
CONTENT
CSS BOX MODEL
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BORDER
PADDING
CONTENT
CSS BOX MODEL
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MARGIN
BORDER
PADDING
CONTENT
CSS BOX MODEL
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MARGIN
BORDER
PADDING
CONTENT
CSS BOX MODEL
MARGIN
BORDER
PADDING
CONTENT
MARGIN
BORDER
PADDING
CONTENT
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https://whitep4nth3r.com
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https://whitep4nth3r.com
← CONTENT →
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https://whitep4nth3r.com
PADDING → ←
← CONTENT →
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https://whitep4nth3r.com
BORDER →
PADDING → ←
← CONTENT →
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https://whitep4nth3r.com
BORDER →
PADDING → ←
← MARGIN →
← CONTENT →
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https://whitep4nth3r.com
BORDER →
PADDING → ←
← MARGIN →
← CONTENT →
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https://whitep4nth3r.com
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CSS BOX MODEL
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CSS BOX MODEL
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.box {
background: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
box-sizing: border-box;
}
CSS BOX MODEL
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.box {
background: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
box-sizing: border-box;
}
CSS BOX MODEL
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WHAT IS
BOX-SIZING?
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BOX-SIZING
The box-sizing property defines
how the width and height of an
element are calculated.
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BOX-SIZING
The box-sizing property defines
how the width and height of an
element are calculated.
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BOX-SIZING
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BOX-SIZING
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BOX-SIZING
box-sizing: border-box;
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BOX-SIZING
box-sizing: border-box;
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BOX-SIZING
box-sizing: border-box; box-sizing: content-box;
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box-sizing: content-box;
BOX-SIZING
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box-sizing: content-box;
BOX-SIZING
BROW
SER DEFAULT
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BOX-SIZING
box-sizing: content-box;
.box {
//* No box-sizing specified **/
background: black;
color: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
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BOX-SIZING
box-sizing: content-box;
.box {
//* No box-sizing specified **/
background: black;
color: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
CALCULATED WIDTH
100%
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BOX-SIZING
box-sizing: content-box;
.box {
//* No box-sizing specified **/
background: black;
color: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
CALCULATED WIDTH
100% + 20PX
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BOX-SIZING
box-sizing: content-box;
CALCULATED WIDTH
100% + 20PX + 10PX
.box {
//* No box-sizing specified **/
background: black;
color: yellow;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
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BOX-SIZING
box-sizing: border-box;
.box {
box-sizing: border-box;
background: yellow;
color: black;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
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BOX-SIZING
box-sizing: border-box;
.box {
box-sizing: border-box;
background: yellow;
color: black;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
CALCULATED WIDTH
100%
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BOX-SIZING
box-sizing: border-box;
.box {
box-sizing: border-box;
background: yellow;
color: black;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
CALCULATED WIDTH
100%
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BOX-SIZING
box-sizing: border-box;
.box {
box-sizing: border-box;
background: yellow;
color: black;
border: 10px solid blue;
padding: 20px;
width: 100%;
}
CALCULATED WIDTH
100%
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THE PROBLEM WITH
CSS RESETS
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CSS RESETS
A CSS reset is a set of CSS rules
that resets the styling of all HTML
elements to a consistent baseline*.
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A CSS reset is a set of CSS rules
that resets the styling of all HTML
elements to a consistent baseline*.
CSS RESETS
*probably opinionated
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undohtml.css
CSS RESETS
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undohtml.css
CSS RESETS
HTML5 Reset
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undohtml.css
CSS RESETS
HTML5 Reset
Normalize.css
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undohtml.css
CSS RESETS
HTML5 Reset
Normalize.css
Sanitize.css
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undohtml.css
CSS RESETS
HTML5 Reset
Normalize.css
Sanitize.css
MiniReset.css
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undohtml.css
CSS RESETS
HTML5 Reset
Normalize.css
Sanitize.css
MiniReset.css
Reboot
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CSS RESETS
* {
box-sizing: border-box;
}
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CSS RESETS
* {
box-sizing: border-box;
}
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* {
box-sizing: border-box;
}
CSS RESETS
← EVERY SINGLE ELEMENT
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https://css-tricks.com/reboot-resets-reasoning/
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CSS RESETS
Understand the behaviour
of your boxes.
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https://developer.mozilla.org/en-US/docs/Web/CSS/box-sizing
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https://developer.mozilla.org/en-US/docs/Web/CSS/box-sizing
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CSS RESETS
Know what you want
to achieve.
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UNDERSTANDING
BROWSER DEFAULTS
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BROWSER
DEFAULTS
YOU
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YOU
BROWSER
DEFAULTS
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User Agent Style Sheet
BROWSER DEFAULTS
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BROWSER DEFAULTS: CHROMIUM
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BROWSER DEFAULTS: FIREFOX
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BROWSER DEFAULTS: FIREFOX
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BROWSER DEFAULTS: FIREFOX
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BROWSER DEFAULTS: SAFARI
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BROWSER DEFAULTS
//* HTML **/
<
This is a box.<
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BROWSER DEFAULTS
//* HTML **/
<
This is a box.<
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BROWSER DEFAULTS
//* HTML **/
<
//* HTML **/
This is a box.<
<This is a box.<
< <Slide 112
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BROWSER DEFAULTS
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BROWSER DEFAULTS
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BROWSER DEFAULTS
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BROWSER DEFAULTS
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BROWSER DEFAULTS
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DIFFERENT TYPES
OF BOXES
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DIFFERENT BOXES
BLOCK
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DIFFERENT BOXES
BLOCK
INLINE
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DIFFERENT BOXES
BLOCK
INLINE
INLINE-*
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DIFFERENT BOXES
BLOCK
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DIFFERENT BOXES
BLOCK
BLOCK
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DIFFERENT BOXES
BLOCK
BLOCK
BLOCK
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DIFFERENT BOXES
BLOCK
BLOCK
BLOCK
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DIFFERENT BOXES
INLINE
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DIFFERENT BOXES
INLINE INLINE
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DIFFERENT BOXES
INLINE
INLINE INLINE
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DIFFERENT BOXES
INLINE
INLINE INLINE
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DIFFERENT BOXES
INLINE
INLINE INLINE
INLINE
INLINE INLINE
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DIFFERENT BOXES
INLINE-*
INLINE-* INLINE-*
INLINE-*
INLINE-* INLINE-*
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Box type block inline-* inline
Breaks onto a new line
✅ ❌ ❌
Fills horizontal space
✅ ❌ ❌
Width + height
✅ ✅ ❌
Push vertical padding +
margin + borders
✅ ✅ ❌
Push horizontal padding +
margin + borders
✅ ✅ ✅
DIFFERENT BOXES
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DIFFERENT BOXES
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Solve all your problems with
this one simple trick!
BROWSER DEFAULTS
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Always declare display.
BROWSER DEFAULTS
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Always declare display.
BROWSER DEFAULTS
Always declare everything.
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WRAPPING
UP
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CSS BOX MODEL
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CSS BOX MODEL
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Think inside the box.
THIS BOX WILL CHANGE YOUR LIFE
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Content + Padding + Border
THIS BOX WILL CHANGE YOUR LIFE
Think inside the box.
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Think outside the box.
THIS BOX WILL CHANGE YOUR LIFE
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Margin
THIS BOX WILL CHANGE YOUR LIFE
Think outside the box.
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Think about the box.
THIS BOX WILL CHANGE YOUR LIFE
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Block
THIS BOX WILL CHANGE YOUR LIFE
Think about the box.
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Block / Inline
THIS BOX WILL CHANGE YOUR LIFE
Think about the box.
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The CSS Box Model
will change your life.
THIS BOX WILL CHANGE YOUR LIFE
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👋 COME AND SAY HI!
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BUILD STUFF,
LEARN THINGS,
LOVE WHAT YOU DO.
@whitep4nth3r
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THANK YOU!
@whitep4nth3r
https://whitep4nth3r.com