chamilo-lms2/main/inc/lib/javascript/jquery-upload/jquery.fileupload-ui.css

.file_upload {
    position: relative;
    overflow: hidden;
    direction: ltr;
    cursor: pointer;
    text-align: center;
    color: #333;
    font-weight: bold;
    -moz-border-radius: 10px;
    -webkit-border-radius: 10px;
    border-radius: 10px;
    width: auto;
    margin-left: auto;
    margin-right: auto;
    height: auto;
    line-height: 50px;
    background-color: #D4E6F0;
    border: 2px dashed #bbbbbb;
    font-size:120%;
    margin-bottom: 0;
}
.form-ajax{
  border: 2px solid #bbbbbb;
  padding: .5em;
  -moz-border-radius: 10px;
  -webkit-border-radius: 10px;
  border-radius: 10px;
}
.file_upload_small {
    line-height: 50px;
    font-size: auto;
    background: #aed1e5;
    border: 2px dashed #bbbbbb;
}

.file_upload_large {
    /*width: 100%;
    height: 150px;
    line-height: 150px; 
    background: palegreen;
    border: 1px solid limegreen;*/
}

.file_upload_highlight {
    background: #9acce9;
    border: 2px dashed #88bbd8;
}

.file_upload input {
    position: absolute;
    top: 0;
    right: 0;
    margin: 0;
    border: 300px solid transparent;
    opacity: 0;
    -ms-filter: 'alpha(opacity=0)';
    filter: alpha(opacity=0);
    -o-transform: translate(-300px, -300px) scale(10);
    -moz-transform: translate(-800px, 0) scale(10);
    cursor: pointer;
}

.file_upload iframe, .file_upload button {
    display: none;
}

.file_upload_preview img {
    width: 80px;
}

.file_upload_progress .ui-progressbar-value {
    background: url(pbar-ani.gif);
}

.file_upload_progress div {
    width: 150px;
    height: 15px;
}

.file_upload_cancel button {
    cursor: pointer;
}