Code Playground

@charset "UTF-8";
@import url(https://fonts.googleapis.com/css?family=Nunito+Sans:300,400,600,700,800);
*,
:after,
:before {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
*{ box-sizing: border-box; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; scroll-behavior: smooth;}
html, body { height: 100%; overflow: hidden;}
body {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    margin: 0;
    background: #cecece;
}
.box {
    width: 20em; height: 12em;
    background: #0f0f0f;
    overflow: hidden;
    border-radius: 1em;
    cursor: not-allowed;
    position: relative;
    margin: 1em;
    border: 0;
    box-shadow: 
    0.1em 0.1em 0.2em 0 #fff3,
    -0.1em -0.1em 0.2em 0 #0003;
}
.box .inset {
    background: #cecece;
    border-radius: 0.9em;
    width: 100%; height: 100%;
    position: relative;
    box-shadow: 
    inset 0em 0em 0em 0em #0006,
    inset 0.1em 0.1em 0.2em 0 #fff3,
    inset -0.1em -0.1em 0.2em 0 #0003;
}
.box .inset::before {
    content: ''; display: block;
    width: 0.8em; height: 7em;
    box-shadow: 
    inset -0.1em -0.1em 0.1em 0.1em #fff3,
    inset 0.1em 0.1em 0.1em 0.1em #0003;
    border-radius: 10px;
    position: absolute;
    top: 0; bottom: 0; margin: auto;
    left: 1em;
}
.box.moving {
    pointer-events: none;
}
.box.pushed .inset {
    animation: pushed 2s ease-in-out forwards;
}
.box.reverse .inset {
    animation: pushed 0.6s ease-in-out reverse forwards;
}
@keyframes pushed {
    0% {
        box-shadow: inset 0em 0em 0em 0em #0006,
        inset 0.1em 0.1em 0.2em 0 #fff3,
        inset -0.1em -0.1em 0.2em 0 #0003;
        scale: 1;
        translate: 0%;
    }
    24% {
        box-shadow: inset 1.6em 1.6em 1em 0em #0006,
        inset 0.1em 0.1em 0.2em 0 #fff3,
        inset -0.1em -0.1em 0.2em 0 #0003;
        translate: 0%;
        scale: 0.9;
        
    }
    100% {
        box-shadow: inset -2.8em 1.6em 1em 0em #0006,
        inset 0.1em 0.1em 0.2em 0 #fff3,
        inset -0.1em -0.1em 0.2em 0 #0003;
        translate: 88%;
        scale: 0.9;
        
    }
}
.box .inset::after {
    content: '';
    display: block;
    width: 100%; height: 100%;
    left: 0; right: 0;
    top: 0; bottom: 0;
    margin: auto;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M32,62A30,30,0,1,0,2,32,30,30,0,0,0,32,62ZM32,4A28,28,0,1,1,4,32,28,28,0,0,1,32,4Z"/><path d="M13.4 49.74h0a1 1 0 0 0 .71-.29L49.45 14.14a1 1 0 0 0 0-1.45A26 26 0 0 0 12.69 49.41 1 1 0 0 0 13.4 49.74zM26 32V17.5a1.5 1.5 0 0 1 3 0V31.76l-8 8V20.5a1.5 1.5 0 0 1 3 0V32zM37.5 16A1.5 1.5 0 0 1 39 17.5v4.26l-3 3V17.5A1.5 1.5 0 0 1 37.5 16zM34 17.5v9.26l-3 3V14.5a1.5 1.5 0 0 1 3 0zM32 8a24 24 0 0 1 15.27 5.48L41 19.76V17.5a3.47 3.47 0 0 0-5-3.14A3.53 3.53 0 0 0 35 12a3.5 3.5 0 0 0-6 2.34A3.36 3.36 0 0 0 27.5 14 3.5 3.5 0 0 0 24 17.36 3.36 3.36 0 0 0 22.5 17 3.5 3.5 0 0 0 19 20.5V41.76l-5.52 5.51A24 24 0 0 1 32 8zM15.63 50.78a1 1 0 0 0 .08 1.49A26 26 0 0 0 52.27 15.71a1 1 0 0 0-1.49-.08L20.45 46zM51.39 17.85A24 24 0 0 1 17.85 51.39L21 48.27A11 11 0 0 0 30 53h1.67a11 11 0 0 0 8-3.48L50.17 38.35A3.72 3.72 0 0 0 48 32.12a3.66 3.66 0 0 0-2.75.71L41 36V28.24zm-11.84 21a1 1 0 0 0 1.05-.09l5.83-4.37a1.7 1.7 0 0 1 2.39.33 1.74 1.74 0 0 1 .35 1A1.72 1.72 0 0 1 48.71 37L38.23 48.16A9 9 0 0 1 31.67 51H30a8.94 8.94 0 0 1-7.57-4.18L39 30.24V38A1 1 0 0 0 39.55 38.89z"/></svg>');
    background-position: 50% 50%;
    background-size: 24%;
    background-repeat: no-repeat;
    position: absolute;
    opacity: 0.05;
    transition: all 0.2s ease-in-out;
}
.box .inset:hover::after {
    animation: red-glow 2s infinite ease-out;
}
@keyframes red-glow {
    0% {
        opacity: 0.1;
        filter: invert(10%) sepia(90%) saturate(4763%) hue-rotate(357deg) brightness(140%) contrast(114%) drop-shadow(0 0 0px red);
    }
    50% {
        opacity: 0.3;
        filter: invert(10%) sepia(90%) saturate(4763%) hue-rotate(357deg) brightness(140%) contrast(114%) drop-shadow(0 0 4px red);
    }
    100% {
        opacity: 0.1;
        filter: invert(10%) sepia(90%) saturate(4763%) hue-rotate(357deg) brightness(140%) contrast(114%) drop-shadow(0 0 0px red);
    }
}

.diamond {
    --_size: 2em;
    --_ratio: 1.8;
    --_speed: 2s;
    --_clr-main: hsl(0, 100%, 50%);
    --_clr-light: hsl(0, 100%, 90%);
    --_clr-dark: hsl(0, 100%, 20%);

width: 0;
    height: 0;
    border: var(--_size) solid transparent;
    border-bottom: calc( var(--_ratio) * var(--_size)) solid var(--_clr-main);
    top: calc( 0px - var(--_size));
    
    animation: hueAni 12s linear infinite;
    
    position: absolute;
    left: 0; right: 0; 
    top: 0; bottom: 50%;
    margin: auto;
    
    transform-origin: 50% 100%;
    opacity: 0.8;
    transition: all 0.4s ease-in-out;
}
.box .diamond:hover {
    opacity: 1;
    scale: 1.2;
}
@keyframes hueAni {
    0% { filter: hue-rotate(0deg); rotate: 0;}    
    100% { filter: hue-rotate(360deg); rotate: -360deg;}    
}

.diamond::after {
    content: '';
    display: block;
    position: absolute;
    width: 4em;
    left: -2em;
    height: 7.2em;
    z-index: -1;
    border-radius: 100%;

background: var(--_clr-main);
    opacity: 1;
    filter: blur(20px);
}
.diamond::before {
    content: '';
    position: absolute;
    left: calc( 0px - var(--_size));
    top: calc(var(--_ratio) * var(--_size) - 0px);
    width: 0;
    height: 0;
    border: var(--_size) solid transparent;
    border-top: calc( var(--_ratio) * var(--_size)) solid var(--_clr-main);
}

.diamond .t {
    position: absolute;
    right: calc( 0.1px - var(--_size));
    top: 0px;
    width: 0;
    height: 0;
    border-bottom: calc( var(--_ratio) * var(--_size)) solid var(--_clr-light);
    border-right: var(--_size) solid transparent;
}
.diamond .t::before {
    content: '';
    position: absolute;
    left: calc( 1px - var(--_size));
    top: 0px;
    width: 0;
    height: 0;
    border-left: var(--_size) solid transparent;

transform-origin: 100% 0%;

animation: ani-t var(--_speed) infinite linear reverse,  ani-t2 var(--_speed) infinite linear;
}
.diamond .t::after {
    content: '';
    position: absolute;
    right: calc( 0px - var(--_size));
    top: 0px;
    width: 0;
    height: 0;
    border-right: var(--_size) solid transparent;
    transform-origin: 0% 0%;

animation: ani-t var(--_speed) infinite linear, ani-t2 var(--_speed) infinite linear ;
}

@keyframes ani-t {
    0% { transform: scaleX(0); }
    100% { transform: scaleX(1); }
}
@keyframes ani-t2 {
    0% { border-bottom: calc( var(--_ratio) * var(--_size)) solid var(--_clr-main); }
    100% { border-bottom: calc( var(--_ratio) * var(--_size)) solid var(--_clr-light); }
}

.diamond .b {
    position: absolute;
    left: calc( 0.1px - var(--_size));
    top: calc( var(--_ratio) * var(--_size));
    width: 0;
    height: 0;
    border-top: calc( var(--_ratio) * var(--_size)) solid var(--_clr-dark);
    border-left: var(--_size) solid transparent;
}
.diamond .b::before {
    content: '';
    position: absolute;
    left: calc( 1px - var(--_size));
    top: calc(0px - var(--_size)*var(--_ratio));
    width: 0;
    height: 0;
    border-left: var(--_size) solid transparent;
    transform-origin: 100% 0%;

animation: ani-b var(--_speed) infinite linear reverse, ani-b2 var(--_speed) infinite linear;
}
.diamond .b::after {
    content: '';
    position: absolute;
    right: calc( 0px - var(--_size));
    top: calc(0px - var(--_size)*var(--_ratio));
    width: 0;
    height: 0;
    border-right: var(--_size) solid transparent;
    transform-origin: 0% 0%;

animation: ani-b var(--_speed) infinite linear, ani-b2 var(--_speed) infinite linear ;
}

@keyframes ani-b {
    0% { transform: scaleX(0); }
    100% { transform: scaleX(1); }
}
@keyframes ani-b2 {
    0% { border-top: calc( var(--_ratio) * var(--_size)) solid var(--_clr-dark); }
    100% { border-top: calc( var(--_ratio) * var(--_size)) solid var(--_clr-main); }
}

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