.btn {
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    font-family: "Roboto mono", sans-serif;
    font-weight: 500;
    border: 1px solid #121212;
    line-height: 1.5;
    font-size: em(14px);
    padding: 16px;
    width: 100%;
    display: block;
    cursor: pointer;
    position: relative;
    background-color: #fff;
    overflow: hidden;
    outline: none;
    text-decoration: none;
    text-align: center;
    
}
.btn:focus {
    outline: none;
}
@media screen and (min-width: 30em) {
    .btn {
        max-width: 220px;
    }
    .btn.btn-small {
        max-width: 180px;
    }
}
@media screen and (min-width: 40em) {
    .btn {
        display: inline-block;
    }
}
.btn-clear {
    background-color: transparent;
}
.btn-clear:hover {
    background-color: #121212;
    color: #fff;
}
.btn-clear.btn-light {
    border-color: #fff;
    color: #fff;
}
.btn-clear.btn-light:hover {
    color: #121212;
    background-color: #fff;
}
.btn-light:hover {
    background-color: #121212;
    color: #fff;
}
.btn-dark {
    background-color: #121212;
    color: #fff;
    border-color: #fff;
}
.btn-dark:hover {
  color: #807f83;
}
.btn-glitch {
    transform: translateZ(0);
    overflow: visible;
}
.btn-glitch.btn-glitch-active {
    -webkit-filter: url("#filter");
    filter: url("#filter");
}
.btn-glitch.btn-glitch-active::after,
.btn-glitch.btn-glitch-active::before {
    content: "";
    width: 1px;
    position: absolute;
    top: -1px;
    bottom: -1px;
}
.btn-glitch.btn-glitch-active::after {
    left: -2px;
    background-color: #ff536b;
    animation: colorshift-red 2.6s infinite;
    animation-timing-function: step-end;
}
.btn-glitch.btn-glitch-active::before {
    right: -2px;
    background-color: #3ffeff;
    animation: colorshift-blue 2.6s infinite;
    animation-timing-function: step-end;
}
body {
    margin: 0;
}
.body-section {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    height: 100vh;
}
.body-section .dark {
    background-color: #121212;
}
.body-section .half {
    flex: 0 0 100%;
    max-height: 50%;
    min-height: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}
@keyframes colorshift-red {
    0%, 7% {
        background-color: #ff536b;
    }
    8%, 18% {
        background-color: transparent;
    }
    19% {
        background-color: #ff536b;
        width: 2px;
    }
    23%, 100% {
        background-color: transparent;
    }
}
@keyframes colorshift-blue {
    0%, 7% {
        background-color: #3ffeff;
    }
    8%, 18% {
        background-color: transparent;
    }
    19% {
        background-color: #3ffeff;
        width: 2px;
    }
    23%, 100% {
        background-color: transparent;
    }
}