@evilcss/std/button/halo.css

Awesome CSS design system and UI widgets

.std-button-halo {
    position: relative;
    z-index: 0;
}
.std-button-halo::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: block;
    width: 100%;
    height: 100%;
    border-radius: var(--button-radius, var(--std-radius1));
    z-index: -1;
    background: var(--button-accent, var(--std-color-primary-accent));
    opacity: 0;
    transform: scale(0);
    transition: all var(--button-duration, var(--std-duration3));
}
.std-button-halo:focus::after,
.std-button-halo:hover::after {
    transform: scale(1);
}
.std-button-halo:hover::after {
    opacity: var(--halo-opacity--hover, .1);
}
.std-button-halo:focus::after {
    opacity: var(--halo-opacity--focus, .1);
}
.std-button-halo:active::after {
    opacity: var(--halo-opacity--active, .2);
}