body {
    height: 100%;
    overflow: hidden;
    background: linear-gradient(to right, black, #2196f3);
}

.menu {
    width: 5em;
    height: 5em;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
}

.menu .btn {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    opacity: 0;
    z-index: -10;
    cursor: pointer;
    transition: opacity 1s, z-index 0.3s, transform 1s;
    transform: translateX(0);
}

.menu .trigger {
    opacity: 1;
    z-index: 100;
    cursor: pointer;
    transition: transform 0.3s;
}

.menu .trigger:hover {
    transform: scale(1.2);
}

.menu .line {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    width: 60%;
    height: 6px;
    background: #fff;
    border-radius: 6px;
    transition: background-color 0.3s, height 0.3s, top 0.3s;
}

.menu .line:before,
.menu .line:after {
    content: "";
    display: block;
    position: absolute;
    left: 0;
    width: 100%;
    height: 6px;
    background: #fff;
    border-radius: 6px;
    transition: background-color 0.3s, transform 0.3s;
}

.menu .line:before {
    top: -12px;
    transform-origin: 15% 100%;
}

.menu .line:after {
    top: 12px;
    transform-origin: 25% 30%;
}

.icons .fab {
    font-size: 3em;
    color: #fff;
    transition: color 0.3s;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
}

.btn:hover .fab {
    color: #000;
}

.menu .rotater {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform-origin: 50% 50%;
}

.menu.active .btn-icon {
    opacity: 1;
    z-index: 50;
}

.menu.active .trigger .line {
    height: 0px;
    top: 45%;
}

.menu.active .trigger .line:before {
    transform: rotate(45deg);
    width: 110%;
}

.menu.active .trigger .line:after {
    transform: rotate(-45deg);
    width: 110%;
}

.rotater:nth-child(1) {
    transform: rotate(-22.5deg);
}

.menu.active .rotater:nth-child(1) .btn-icon {
    transform: translateY(-10em) rotate(22.5deg);
}

.rotater:nth-child(2) {
    transform: rotate(22.5deg);
}

.menu.active .rotater:nth-child(2) .btn-icon {
    transform: translateY(-10em) rotate(-22.5deg);
}

.rotater:nth-child(3) {
    transform: rotate(67.5deg);
}

.menu.active .rotater:nth-child(3) .btn-icon {
    transform: translateY(-10em) rotate(-67.5deg);
}

.rotater:nth-child(4) {
    transform: rotate(112.5deg);
}

.menu.active .rotater:nth-child(4) .btn-icon {
    transform: translateY(-10em) rotate(-112.5deg);
}

.rotater:nth-child(5) {
    transform: rotate(157.5deg);
}

.menu.active .rotater:nth-child(5) .btn-icon {
    transform: translateY(-10em) rotate(-157.5deg);
}

.rotater:nth-child(6) {
    transform: rotate(202.5deg);
}

.menu.active .rotater:nth-child(6) .btn-icon {
    transform: translateY(-10em) rotate(-202.5deg);
}

.rotater:nth-child(7) {
    transform: rotate(247.5deg);
}

.menu.active .rotater:nth-child(7) .btn-icon {
    transform: translateY(-10em) rotate(-247.5deg);
}

.rotater:nth-child(8) {
    transform: rotate(292.5deg);
}

.menu.active .rotater:nth-child(8) .btn-icon {
    transform: translateY(-10em) rotate(-292.5deg);
}