.viewer-dropzone {
    position: relative;
    z-index: 10;
    padding: 10px;
    margin: 15px 0 0 15px;
    width: 120px;
    box-sizing: border-box;
    border-radius: 5px;
    border: 2px dashed #ccc;
    cursor: pointer;
}

.viewer-dropzone:hover {
    border-color: #ccc;
}

.viewer-upload {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: 120px;
    opacity: 0;
    cursor: pointer;
}

.viewer-text {
    font-weight: 400;
    font-size: 12px;
    line-height: 10px;
    text-shadow: 0 1px 0 #fff;
}

@-webkit-keyframes viewer-preloader {
    from {
        -webkit-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    to {
        -webkit-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}

.viewer-preloader {
    z-index: 10;
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -16px 0 0 -16px;
    width: 32px;
    height: 32px;
    display: none;
    overflow: hidden;
    -webkit-animation-name: viewer-preloader;
    -webkit-animation-duration: 1s;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-timing-function: linear;
    animation-name: viewer-preloader;
    animation-duration: 1s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
}

.viewer-preloader__circle {
    overflow: hidden;
    position: absolute;
    left: 50%;
    top: 0;
    width: 100%;
    height: 100%;
}

.viewer-preloader__circle:before {
    content: '';
    border-radius: 100%;
    box-shadow: inset 0 0 0 2px #999;
    position: absolute;
    left: -50%;
    top: 0;
    width: 100%;
    height: 100%;
}