body {    margin: 0; padding: 0;    background: #1d1d1d;background:url('../images/sign.png') no-repeat; width:100%;height:40%;background-size:100% 100%;}* {    box-sizing: border-box;}h1, h2, h3,h4, h5, h6, p, ul, li {    margin: 0; padding: 0;}li { list-style: none; }