.loader {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    width: 48px;
    height: 48px;
    margin: -24px 0 0 -24px;
    border: 4px solid #7eb1e4;
    border-top-color: transparent;
    border-radius: 50%;
    animation: loader-rotation 0.8s linear infinite;
    box-sizing: border-box;
    z-index: 9999;
}

.loader.is-active {
    display: block;
}

@keyframes loader-rotation {
    to {
        transform: rotate(360deg);
    }
}