.hamburger-icon {
    margin: 0;
    padding: 19px 16px;
    display: inline-block;
    position: absolute;
    top: 0;
    left: 0;
}

    .hamburger-icon span {
        width: 40px;
        background-color: #000;
        height: 5px;
        display: block;
        margin-bottom: 6px;
    }

        .hamburger-icon span:last-child {
            margin-bottom: 0px;
        }