Making some basic animations with box-shadows. No extra elements or even pseudo elements required.
Check out my button collection for more.
<div class="buttons"> | |
<h1>Simple hover effects with <code>box-shadow</code></h1> | |
<button class="fill">Fill In</button> | |
<button class="pulse">Pulse</button> | |
<button class="close">Close</button> | |
<button class="raise">Raise</button> | |
<button class="up">Fill Up</button> | |
<button class="slide">Slide</button> | |
<button class="offset">Offset</button> | |
</div> |
/* | |
https://developer.mozilla.org/en/docs/Web/CSS/box-shadow | |
box-shadow: [inset?] [top] [left] [blur] [size] [color]; | |
Tips: | |
- We're setting all the blurs to 0 since we want a solid fill. | |
- Add the inset keyword so the box-shadow is on the inside of the element | |
- Animating the inset shadow on hover looks like the element is filling in from whatever side you specify ([top] and [left] accept negative values to become [bottom] and [right]) | |
- Multiple shadows can be stacked | |
- If you're animating multiple shadows, be sure to keep the same number of shadows so the animation is smooth. Otherwise, you'll get something choppy. | |
*/ | |
// Animate the size, inside | |
.fill:hover, | |
.fill:focus { | |
box-shadow: inset 0 0 0 2em var(--hover); | |
} | |
// Animate the size, outside | |
.pulse:hover, | |
.pulse:focus { | |
animation: pulse 1s; | |
box-shadow: 0 0 0 2em rgba(#fff,0); | |
} | |
@keyframes pulse { | |
0% { box-shadow: 0 0 0 0 var(--hover); } | |
} | |
// Stack multiple shadows, one from the left, the other from the right | |
.close:hover, | |
.close:focus { | |
box-shadow: | |
inset -3.5em 0 0 0 var(--hover), | |
inset 3.5em 0 0 0 var(--hover); | |
} | |
// Size can also be negative; see how it's smaller than the element | |
.raise:hover, | |
.raise:focus { | |
box-shadow: 0 0.5em 0.5em -0.4em var(--hover); | |
transform: translateY(-0.25em); | |
} | |
// Animating from the bottom | |
.up:hover, | |
.up:focus { | |
box-shadow: inset 0 -3.25em 0 0 var(--hover); | |
} | |
// And from the left | |
.slide:hover, | |
.slide:focus { | |
box-shadow: inset 6.5em 0 0 0 var(--hover); | |
} | |
// Multiple shadows, one on the outside, another on the inside | |
.offset { | |
box-shadow: | |
0.3em 0.3em 0 0 var(--color), | |
inset 0.3em 0.3em 0 0 var(--color); | |
&:hover, | |
&:focus { | |
box-shadow: | |
0 0 0 0 var(--hover), | |
inset 6em 3.5em 0 0 var(--hover); | |
} | |
} | |
//=== Set button colors | |
// If you wonder why use Sass vars or CSS custom properties... | |
// Make a map with the class names and matching colors | |
$colors: ( | |
fill: #a972cb, | |
pulse: #ef6eae, | |
close: #ff7f82, | |
raise: #ffa260, | |
up: #e4cb58, | |
slide: #8fc866, | |
offset: #19bc8b | |
); | |
// Sass variables compile to a static string; CSS variables are dynamic and inherited | |
// Loop through the map and set CSS custom properties using Sass variables | |
@each $button, $color in $colors { | |
.#{$button} { | |
--color: $color; | |
--hover: adjust-hue($color, 45deg); | |
} | |
} | |
// Now every button will have different colors as set above. We get to use the same structure, only changing the custom properties. | |
button { | |
color: var(--color); | |
transition: 0.25s; | |
&:hover, | |
&:focus { | |
border-color: var(--hover); | |
color: #fff; | |
} | |
} | |
//=== Pen styling, ignore | |
body { | |
color: #fff; | |
background: hsl(227, 10%, 10%); | |
font: 300 1em 'Fira Sans', sans-serif; | |
// Center everything ever | |
justify-content: center; | |
align-content: center; | |
align-items: center; | |
text-align: center; | |
min-height: 100vh; | |
display: flex; | |
} | |
// Basic button styles | |
button { | |
background: none; | |
border: 2px solid; | |
font: inherit; | |
line-height: 1; | |
margin: 0.5em; | |
padding: 1em 2em; | |
} | |
h1 { font-weight: 400; } | |
code { | |
color: #e4cb58; | |
font: inherit; | |
} | |
/* | |
As a bonus, I will now begin including a shoddily written limerick or other high literary masterpiece in all my pens. Misspelled visual rhymes and two left feet are the spice of life. You're welcome. | |
[1/?] Glass cannon | |
There was a young dev on the frontend | |
delighted to see folks affronted | |
They claimed satisfaction | |
provoking a reaction | |
but threw quite a fit when confronted | |
*/ |