*,
*::before,
*::after{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html{
    font-family: Arial, Helvetica, sans-serif;
    color: #fff;
    background-color: #00BBFF;
    background-image: url('background.jpg');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: 50% 50%;
}

body{
    min-height: 100vh;
}

.content{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

.content::before,
.content::after{
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    height: 5vh;
    background-color: rgba(255,255,255,.3);
}

.content::before{top: 0;}
.content::after{bottom: 0;}

.content ul{
    list-style: none;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 5rem;
    position: absolute;
    bottom: 5.5vh;
    left: 0;
    right: 0;
}

.content ul li::after{
    content: '';
    height: .25rem;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    transition: 700ms;
    border-radius: 1vh;
    background-color: #fff;
}

.content ul li:hover::after{
    opacity: 1;
    text-shadow: 0 0 1vh rgba(255,255,255,.4),
                 0 0 3vh rgba(255,255,255,.6),
                 0 0 5vh rgba(255,255,255,.8),
                 0 0 7vh rgba(255,255,255,1);

    box-shadow: 0 0 1vh rgba(255,255,255,.4),
                0 0 3vh rgba(255,255,255,.6),
                0 0 5vh rgba(255,255,255,.8),
                0 0 7vh rgba(255,255,255,1);
}

@keyframes fadeInOut {
    0%,100%{
        opacity: .5;
    }
    50%{
        opacity: 1;
    }
}

.content ul li{
    position: relative;
    text-align: center;
}

.content ul li:nth-child(n+2):not(li:nth-child(5)){
    margin-bottom: 2.5vh;
}

.content ul li a{
    text-decoration: none;
    font-size: 5vh;
    color: #fff;
}