.metabox-input-group {
    margin: 1rem auto;
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
}

.metabox-input-group > label {
    width: 100%;
    max-width: 30%;
}

@media screen and (min-width: 768px) {
    .metabox-input-group > label {
        width: 100%;
        max-width: 10%;
        padding-right: 10px;
    }
}

.metabox-input-group > label + * {
    flex: 1;
}

.metabox-input-group > label + * input, .metabox-input-group > label + * select, .metabox-input-group > label + * textarea {
    width: 100%;
}

.metabox-input-group .images-container {
    width: 100%;
}

.metabox-input-group .images-collection {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    margin: 5px -15px;
}

.metabox-input-group .images-collection li {
    padding-left: 15px;
    padding-right: 15px;
    margin-bottom: 15px;
    margin-top: 15px;
}
.metabox-input-group .images-collection li .inner {
    height: 150px;
    width: 150px;
    border: 2px solid slategray;
    border-radius: 5px;
}

.metabox-input-group .images-collection li .meta-collection__item, .metabox-input-group .images-collection li .meta-collection__item .collection-single-img {
    height: 100%;
    position: relative;
}

.metabox-input-group .images-collection li .meta-collection__item a.check {
    height: 15%;
    width: 15%;
    position: absolute;
    top: 0;
    right: 0;
    background: red;
    border-radius: 3px;
    border: 1px solid;
    opacity: 0;
    pointer-events: none;
    transition: .2s all linear;
}

.metabox-input-group .images-collection li .meta-collection__item a.check::after {
    content: '\00d7';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    height: 70%;
    width: 70%;
    text-align: center;
    line-height: .6;
    color: white;
    font-size: 1.5em;
}

.metabox-input-group .images-collection li .meta-collection__item:hover a.check {
    opacity: 1;
    pointer-events: all;
}

.metabox-input-group .images-collection li .collection-single-img {
    background-position: center;
    background-size: cover;
}

.metabox-input-group .images-collection li .collection-single-img img {
    visibility: hidden;
    max-width: 100%;
    max-height: 100%;
}