rilwis/meta-box

.rwmb-upload-area {
    height: 200px;
    border: 4px dashed #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.rwmb-upload-inside h3 {
    font-size: 20px;
    line-height: 1.4;
    font-weight: 400;
    margin: 0;
}

.rwmb-upload-inside p {
    margin: .5em 0;
}

/* Progress bar */
.rwmb-progress {
    --height: 16px;

    margin-bottom: 12px;

    position: relative;
    z-index: 1;

    border-radius: 99px;
    background-color: #ddd;

    height: var(--height);
    line-height: var(--height);
    color: #fff;
    font-size: 11px;
    text-align: center;
}

.rwmb-progress:before {
    display: block;
    content: "";

    position: absolute;
    width: calc(var(--value) * 1%);
    height: 100%;
    z-index: -1;

    background-image: linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
    background-size: 16px 16px;
    background-color: var(--wp-admin-theme-color, #2271b1);
    border-radius: 99px 0 0 99px;
}

.rwmb-progress--completed:before {
    border-radius: 99px;
    animation: progress 1s linear infinite;
}

@keyframes progress {
    0% {
        background-position: 0 0;
    }

    100% {
        background-position: 16px 0px;
    }
}