4dkankan_bim/src/assets/scss/components/_loading.scss

.ui-loading {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: rgba($color: #000000, $alpha: 0.3);
    --width: 15px;
    --color: #fff;
}
.ui-loading__box {
    position: relative;
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    .default {
        div {
            width: var(--width);
            height: var(--width);
            background: var(--color);
            border-radius: 50%;
            display: inline-block;
            margin-left: calc(var(--width));
        }
        div:nth-child(1) {
            animation: ui-loading-default 1s -0.5s linear infinite;
        }
        div:nth-child(2) {
            animation: ui-loading-default 1s -0.25s linear infinite;
        }
        div:nth-child(3) {
            animation: ui-loading-default 1s 0s linear infinite;
        }
    }
}

@keyframes ui-loading-default {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(0.5);
        opacity: 0.5;
    }
    100% {
        transform: scale(1);
        opacity: 0.8;
    }
}