#form_container
{
padding:15px 15px;
margin-top:15px;
background: rgba(0,0,0,0.5);	
color:#fff;
}
body
{
background: rgba(0,0,0,1);

}
.upload-btn-wrapper 
{
position: relative;
overflow: hidden;
display: inline-block;
}

.upload-btn-wrapper input[type=file] 
{
font-size: 100px;
position: absolute;
left: 0;
top: 0;
opacity: 0;
}