style.scss

body, html {
  //cambiar color del bar
  .nicdark_navigation .var > li > a{
  color:blue;

  font-family: "Open Sans", sans-serif;

}

  font-size: 14px;
  width:100% ;
  height: 100%;
  margin: 0;
  padding: 0;
}

section {
  background-image: url(https://www.tcs.com/content/dam/tcs/images/discover-tcs/tcs50/timeline/V3-V5-Web@2x.jpg/jcr:content/renditions/tcs_1x.jpeg);

   width: 100%;
   height: 100%;
   background-size: cover;
}

header{
  //no sirve
 background-image: linear-gradient(to bottom, rgba(0,0,0,0.5), rgba(0,0,0,0));
 width: 100%;
  position: absolute;
  left: 0;
  top: 0;

 //color de letras del bar
  ul{
   list-style: none;
    position: absolute;
    right: 0;
    li{
      color:#fff;
      width: 150px;
      float: left;
      font-weight: 400;

    }
  }
}
div{
  position: absolute;
  width: 500px;
  height: 500px;
  left: 50%;
  top:50%;
  margin-top: -150px;
  margin-left: -250px;
  //color de letras centrales
  h1 {
    font-size: 25px;
    color: #fff;
    font-weight: 300;
  }
  input {
    width: 100%;
    height: 30px;
    padding: 20;
    border-radius: 25px;
  }
}