.btn {
    position: relative;

    display: block;
    padding: 10px;

    overflow: hidden;

    border-width: 0;
    outline: none;
    border-radius: 2px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, .6);

    background-color: rgba(10, 4, 12, 0.85);
    color: #ecf0f1;

    transition: background-color .3s;
}