.btn-file {
    position: relative;
    overflow: hidden;
}
.btn-file input[type=file] {
    position: absolute;
    top: 0;
    right: 0;
    min-width: 100%;
    min-height: 100%;
    font-size: 100px;
    text-align: right;
    filter: alpha(opacity=0);
    opacity: 0;
    background: red;
    cursor: inherit;
    display: block;
}
.file-input-label {
    padding: 0px 10px;
    display: table-cell;
    vertical-align: middle;
    border: 1px solid #ddd;
    border-radius: 4px;
}
input[readonly] {
    background-color: white !important;
    cursor: text !important;
}