custom.css

    .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;
    }

.highlight {
  padding: 9px 9px;
  margin-top: 14px;
  background-color: #f7f7f9;
  border: 1px solid #e1e1e8;
  border-radius: 4px;
}

div#result {
      font-size: 90%;
    line-height: 1.2em;
    font-family: "Courier 10 Pitch", Courier, monospace; 
    white-space: pre; 
    white-space: pre-wrap; 
    white-space: -moz-pre-wrap; 
    white-space: -o-pre-wrap; 

    height:1%;
    width: auto;
    display: block;
    clear: both;
    color: #000000;
    padding: 1em 1em;
}

.glyphicon.spinning {
    animation: spin 1s infinite linear;
    -webkit-animation: spin2 1s infinite linear;
}

@keyframes spin {
    from { transform: scale(1) rotate(0deg);}
    to { transform: scale(1) rotate(360deg);}
}

@-webkit-keyframes spin2 {
    from { -webkit-transform: rotate(0deg);}
    to { -webkit-transform: rotate(360deg);}
}