root.css

:root {
    --font-family: 'Exo 2', sans-serif;
    --background-color: #1a1a1a;
    --alternative-background-color: black;
    --accent-color: orangered;
    --white: white;
    --low-white: #dfdfdf;
    --gray: #878787;
    --block-color: #2b2b2b;
    --alternative-block-color: #494949;
    --drawer-background-color: #2b2b2b;
}

body {
    width: 100vw;
    height: 100vh;
    margin: 0;
    font-family: var(--font-family);
    overflow-x: hidden;
}

main {
    width: 100vw;
    min-height: 100vh;
    background-color: var(--background-color);
    cursor: default;
    display: flex;
    align-items: center;
    flex-direction: column;
    margin-bottom: 90px;
    overflow-x: hidden;
    overflow-y: auto;
}

#main {
    width: inherit;
    height: 100vh;
    overflow-x: inherit;
    overflow-y: auto;
    box-sizing: border-box;
}

section {
    width: inherit;
}

a {
    color: var(--white);
}

label {
    color: var(--white);
}

.button {
    color: var(--white);
    text-decoration: none;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 5px;
    text-transform: uppercase;
    border: 2px solid var(--white);
    border-radius: 10px;
    padding: 10px 15px;
    overflow: hidden;
    background: none;
    position: relative;
}

.button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: var(--white);
    transition: width 500ms;
    z-index: 0;
}

.button:hover::before {
    width: 100%;
}

.button span {
    z-index: 1;
    transition: color font-weight 500ms;
}

.button:hover {
    color: var(--black);
    border-color: transparent;
}

.button .arrow {
    width: 0;
    height: 0;
    margin-top: -5px;
    margin-bottom: -5px;
    margin-left: -5px;
    opacity: 0;
    transition-property: width height margin-left opacity;
    transition-duration: 300ms;
}

.button:hover .arrow {
    width: 24px;
    height: 24px;
    margin-left: 0;
    opacity: 1;
    transition-property: width height margin-left margin-right opacity;
    transition-duration: 300ms;
}

.button .arrow {
    width: 0;
    height: 0;
    margin-top: -5px;
    margin-bottom: -5px;
    margin-left: -5px;
    opacity: 0;
    transition-property: width height margin-left opacity;
    transition-duration: 300ms;
}

.button:hover .arrow {
    width: 24px;
    height: 24px;
    margin-left: 0;
    margin-right: -5px;
    opacity: 1;
    transition-property: width height margin-left margin-right opacity;
    transition-duration: 300ms;
}

#loading-container {
    width: 100%;
    height: 100%;
    position: fixed;
    background-color: var(--background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    z-index: 999;
    animation: fade-out 1s normal 2s forwards;
}

@keyframes fade-out {
    from {
        opacity: 100%;
    }

    to {
        opacity: 0%;
        display: none;
    }
}

.loading-icon {
    width: 70px;
    height: 70px;
    animation: rotate360 1.2s infinite linear;
}

@keyframes rotate360 {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.bouncing-ball {
    position: sticky;
    width: 40px;
    height: 40px;
    top: calc(100% - 44px);
    margin-bottom: 4px;
    animation: bounce 800ms infinite ease-out;
    background-image: url(assets/square.png);
    background-size: contain;
    border-radius: 50%;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    60% {
        transform: translateY(-50px);
    }
}

.slide-left {
    opacity: 0;
    transform: translateX(-50%);
    transition: opacity 1s ease-in, transform 800ms ease;
}

.slide-left.in-view {
    opacity: 1;
    transform: translateX(0);
}

.slide-right {
    opacity: 0;
    transform: translateX(50%);
    transition: opacity 1s ease-in, transform 800ms ease;
}

.slide-right.in-view {
    opacity: 1;
    transform: translateX(0);
}