body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: black;
}

.loader {
    width: 40em;
    height: 1em;
    font-size: 10px;
    position: relative;
}

.loader span {
    position: absolute;
    width: inherit;
    height: inherit;
}