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/* Global */
:root {
--focus-color: forestgreen;
--input-margin: 0.4em;
--transition-duration: 0.2s;
}
html, body {
height: 100%;
margin: 0;
}
body {
font: 21px sans-serif;
background-color: white;
}
/* Core style */
form {
height: 100%;
max-width: 20em;
margin-left: auto;
margin-right: auto;
/* Align inputs vertically and
* center them vertically and horizontally
*/
display: flex;
align-items: center;
justify-content: center;
flex-direction: column;
}
form > section {
width: 100%;
}
input {
width: 100%;
border: 0;
border-bottom: 1px solid grey;
padding: 0.4em;
padding-left: 0;
box-sizing: border-box;
font-size: inherit;
margin-bottom: 0.5em;
}
input:focus, button:focus {
outline: 0;
}
/* Where the magic happens */
.input-selection {
position: relative;
margin-top: 0.7em;
}
.input-selection label {
transition: var(--transition-duration);
width: inherit;
height: inherit;
position: absolute;
margin-top: var(--input-margin);
scale: 1em;
color: grey;
left: 0;
}
.input-selection input::placeholder {
/* Don't show the placeholder when the label is on top */
opacity: 0;
color: grey;
}
.input-selection:hover > input::placeholder,
.input-selection > input:focus::placeholder {
/* When hovering on the input, or when having clicked on it,
* show the placeholder
*/
opacity: 1;
}
.input-selection:hover > label,
.input-selection > input:not(:placeholder-shown) + label,
.input-selection > input:focus + label {
/* When hovering, typing or having typed something in an input,
* make the label smaller, color it and then move it up
*/
font-size: 0.7em;
color: var(--focus-color);
transform: translate(0, -1.2em);
}
.input-selection:hover > input,
.input-selection > input:focus {
/* When hovering or clicked on it, make it the focus color */
border-color: var(--focus-color) !important;
caret-color: var(--focus-color);
/* When hovering or clicked on it, make the bottom border wider (taller) */
border-width: 2px !important;
padding-bottom: calc(var(--input-margin) - 1px) !important;
}
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