* {
    margin: 0;
    padding: 0;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-size: 14px;
    position: relative;
    background: black;
}

.loader-wrapper {
    position: absolute;
    width: 100%;
    height: 100%;
    background: #212121;
    transition: 0.5s ease-in-out;
}

.loader {
    position: absolute;
    top: 50%;
    left: 50%;
    background: #fff;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: bounce 1s ease-in-out infinite;
    transition: 0.5s ease-in-out;
}

@keyframes bounce {
    0% {
        top: 15%;
    }

    50% {
        top: 50%;
    }

    100% {
        top: 15%;
    }
}