*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    height: 100vh;
    background: #17a2b8;
    overflow: hidden;
}
nav{
    position: absolute;
    top: 20px;
    right: 0;
    width: 80px;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
}
nav .nav-content{
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(-45deg);
}
.nav-content .toggle-btn,
.nav-content span a{
    height: 60px;
    width: 60px;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(0,0,0,0.2);
}
.nav-content .toggle-btn{
    font-size: 35px;
    color: #0e2431;
    z-index: 100;
    cursor: pointer;
    transform: rotate(-225deg);
    transition: all 0.6s ease;
}
nav.open .toggle-btn{
    transform: rotate(0deg);
}
.nav-content span{
    position: absolute;
    transition: all 0.6s ease;
    opacity: 0;
}
nav.open .nav-content span{
    transform: rotate(calc(var(--i) * (360deg/8))) translateY(120px);
    opacity: 1;
}
.nav-content span a{
    text-decoration: none;
    transform: rotate(45deg);
}
.nav-content span a i{
    transform: rotate(calc(var(--i) * (360deg/-8)));
    font-size: 24px;
    color: #0e2431;
    opacity: 0.8;
    transition: 0.2s;
}
.nav-content span a:hover i{
    opacity: 1;
}