style.scss

:root {
    --primary-color-black: #000000;
    --primary-color-white: #ffffff;
    --secondary-color-white: #dfdddd;
    --primary-color-red: #ff0000;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Droid Sans", sans-serif;
}

@keyframes flip {
    0% {
        transform: rotateX(0deg);
    }

    30% {
        transform: rotateX(0deg);
    }

    100% {
        transform: rotateX(360deg);
    }
}

@keyframes jump {
    0% {
        transform: translateY(0px);
    }

    30% {
        transform: translateY(-10px);
    }

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

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

    50% {
        transform: rotate(360deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

@keyframes color {
    from {
        color: var(--primary-color-white);
    }

    to {
        color: var(--primary-color-red);
    }
}

body {
    background-color: var(--primary-color-black);
    color: var(--primary-color-white);

    main {
        display: flex;
        justify-content: center;
        align-items: center;
        flex-direction: column;
        height: 100vh;

        .loading {
            font-size: 1.5rem;
            margin: 3.75rem auto;
            perspective: 5.625rem;

            div {
                display: inline-block;
                animation-name: flip;
                animation-duration: 2s;
                animation-iteration-count: infinite;
                transform-origin: 50% 50% 8px;
                transform-style: preserve-3d;
            }

            .l1 {
                animation-delay: 0.1s;
            }

            .l2 {
                animation-delay: 0.2s;
            }

            .l3 {
                animation-delay: 0.3s;
            }

            .l4 {
                animation-delay: 0.4s;
            }

            .l5 {
                animation-delay: 0.5s;
            }

            .l6 {
                animation-delay: 0.6s;
            }

            .l7 {
                animation-delay: 0.7s;
            }

            .l8 {
                animation-delay: 0.8s;
            }

            .l9 {
                animation-delay: 0.9s;
            }

            .l10 {
                animation-delay: 1s;
            }
        }
        
        button {
            display: inline-block;
            margin: 0.3rem auto;
            padding: 0.625rem 0.938rem;
            cursor: pointer;
            box-shadow: 5px 5px 5px var(--primary-color-red);
        }

        button:hover {
            background-color: var(--secondary-color-white);
            box-shadow:0 0 10px var(--primary-color-red);
        }
    }
}

@media (max-width: 200px) {
    .loading {
        font-size: 0.1rem;
        perspective: 0.1rem;
        margin: 0.1rem auto;
    }

    button {
        padding: 0.1rem;
    }
}