Change file_field_tag appearance

Change file_field_tag appearance



<span class="btn btn-large btn-warning btn-file">
    Choose File
    <%= file_field_tag :attachment %>


.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;
    outline: none;
    background: white;
    cursor: inherit;
    display: block;

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