body {
     position: relative;
     background-color: black;
 }
 .affix {
     top: 20px;
     z-index: 9999 !important;
 }
 div.col-sm-9 div {
     height: 250px;
     font-size: 28px;
 }
 #section1 {
     color: #fff;
     /*     background-color: rgba(0, 0, 0, 0.7);*/
     background: linear-gradient(0deg, rgba(255, 0, 150, 0.0)0%, rgba(0, 0, 0, 0.9)15%, rgba(0, 0, 0, 0.9)85%, rgba(255, 0, 150, 0.0)100%);
     height: 700px;
 }
 #section2 {
     color: #fff;
     /*     background-color: rgba(0, 0, 0, 0.7);*/
     background: linear-gradient(0deg, rgba(255, 0, 150, 0.0)0%, rgba(0, 0, 0, 0.9)15%, rgba(0, 0, 0, 0.9)85%, rgba(255, 0, 150, 0.0)100%);
     height: 700px;
 }
 #section3 {
     color: #fff;
     background: linear-gradient(0deg, rgba(255, 0, 150, 0.0)0%, rgba(0, 0, 0, 0.9)15%, rgba(0, 0, 0, 0.9)85%, rgba(255, 0, 150, 0.0)100%);
     /*     background: linear-gradient(0deg, rgba(0, 0, 0, 0.9)80%, rgba(255, 0, 150, 0.0));*/
     /*     background-color: #000;*/
     height: 700px;
 }
 #section4 {
     color: #fff;
     background: linear-gradient(0deg, rgba(255, 0, 150, 0.0)0%, rgba(0, 0, 0, 0.9)15%, rgba(0, 0, 0, 0.9)85%, rgba(255, 0, 150, 0.0)100%);
     height: 700px;
 }
 #section5 {
     color: #fff;
     background: linear-gradient(0deg, rgba(255, 0, 150, 0.0)0%, rgba(0, 0, 0, 0.9)15%, rgba(0, 0, 0, 0.9)85%, rgba(255, 0, 150, 0.0)100%);
     height: 700px;
     margin-top: 100px;
 }
 #section6 {
     color: #fff;
     background: linear-gradient(0deg, rgba(255, 0, 150, 0.0)0%, rgba(0, 0, 0, 0.9)15%, rgba(0, 0, 0, 0.9)85%, rgba(255, 0, 150, 0.0)100%);
     height: 700px;
 }
 @media screen and (max-width: 810px) {
     #section1,
     #section2,
     #section3,
     #section41,
     #section42 {
         margin-left: 150px;
     }
 }
 ul {
     background: linear-gradient(0deg, rgba(255, 0, 150, 0.0)0%, rgba(0, 0, 0, 0.9)15%, rgba(0, 0, 0, 0.9)85%, rgba(255, 0, 150, 0.0)100%);
     position: fixed;
     margin-top: 30vh;
     margin-left: -70px;
 }
 li {
     color: white;
 }
 li:hover {
     color: red;
 }
 .w3-button {
     color: black;
 }