la-visitor/theme/style/loading-screen.css

.loading {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: white;
    color: black;
}

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

    25% {
        transform: rotate(90deg);
    }

    50% {
        transform: rotate(180deg);
    }

    75% {
        transform: rotate(270deg);
    }

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

.loading .animation span {
    font-size: 1000%;
    animation-name: loading-rotate;
    animation-duration: 4s;
    animation-iteration-count: infinite;
    animation-timing-function: backward;
}