.active{opacity:1}body{padding-top:60px}.border-img{border:2px dashed #000}.a-button{display:inline-block;padding:10px 20px;background-color:#4caf50;color:#fff;text-align:center;text-decoration:none;border:none;border-radius:5px;cursor:pointer}.a-button:hover{background-color:#3e8e41}.error-message{color:#d8000c;background-color:#fdd}