.circle {
    position: relative;
    aspect-ratio: 1
}

.letter {
    position: absolute;
    top: 0;
    left: 50%;
    font-family: Rubik Mono One,sans-serif;
    color: #0ff
}

@keyframes gradientMove {
    0% {
        background-position: 0 50%
    }

    50% {
        background-position: 100% 50%
    }

    to {
        background-position: 0 50%
    }
}

@keyframes gradient {
    0% {
        background-position: 0 50%
    }

    50% {
        background-position: 100% 50%
    }

    to {
        background-position: 0 50%
    }
}

button:hover {
    animation: gradient .5s ease infinite
}

.menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #202020;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    z-index: -1
}

.menu.open {
    opacity: 1;
    visibility: visible;
    z-index: 1000
}

.menu ul {
    list-style: none;
    padding: 0
}

.menu ul li {
    margin: 10px 0;
    font-size: 18px;
    text-align: center;
    color: #0ff
}

.menu ul li ul {
    margin-top: 2px;
    padding: 0;
    margin-left: 20px;
    font-size: 18px;
    font-weight: 300
}

.menu ul li ul li {
    margin: 10px 0
}

.menu-button {
    position: absolute;
    top: 30px;
    left: 20px;
    font-size: 24px;
    cursor: pointer;
    z-index: 1001;
    color: #0ff;
    transition: color .3s;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 50px
}

.menu-button:hover {
    color: #fff
}

.hover-link {
    color: #0ff;
    text-decoration: none;
    transition: color .3s ease
}

.hover-link:hover {
    color: #fff
}

.center-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%
}