.loader-overlay {
    width: 100vw;
    height: 100vh;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.5);
    visibility: hidden;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 10;
}

    .loader-overlay.active {
        visibility: visible;
        opacity: 1;
    }

.loader {
    width: 100px;
    height: 100px;
    border: 5px solid #FFF;
    border-bottom-color: transparent;
    border-radius: 50%;
    border-width: 10px;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
}

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

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