body {
    background-color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    margin: 0;
}

/* Centered UL */
ul {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    transform: rotate(-35deg) skew(20deg, 5deg);
    list-style: none;
    padding: 0;
    margin: 0;
}

.list-item {
    background: linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(39,167,243,1) 35%, rgba(0,212,255,1) 100%);
    color: #fff;
    text-align: center;
    height: 2.5em;
    width: 4em;
    line-height: 2.5em;
    border-bottom: 1px solid #06060606;
    position: relative;
    display: block;
    text-decoration: none;
    box-shadow: -2em 1.5em 0 #333;
    transition: all .25s linear;
    margin: 10px 0; /* spacing between items */
    border-radius: 6px;
}

.list-item a {
    color: #fff;
    font-size: 20px;
}

/* Hover animation */
.list-item:hover {
    background: linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(255,110,66,1) 35%, rgba(0,212,255,1) 100%);
    color: #fffcfb;
    transform: translate(0.9em, -0.9em);
    box-shadow: -2em 2em 0 #333;
}

.list-item:hover::before,
.list-item:hover::after {
    transition: all 0.25s linear;
}

.list-item:hover::before {
    background-color: #b65234;
    width: 1em;
    top: 0.5em;
    left: -1em;
}

.list-item:hover::after {
    background: #b65234;
    width: 1em;
    bottom: -2.5em;
    left: 1em;
    height: 4em;
}

.list-item::before,
.list-item::after {
    content: '';
    position: absolute;
    transition: all .25s linear;
    width: 0.5em;
}

.list-item::after {
    height: 4em;
    background-color: #181818;
    bottom: -2.25em;
    left: 1.5em;
    transform: rotate(90deg) skew(0, 45deg);
}

.list-item::before {
    height: 2.5em;
    background-color: #121212;
    top: 0.25em;
    left: -0.5em;
    transform: skewY(-45deg);
}