.body {
background:linear-gradient(rgb(255, 0, 0),rgb(0, 0, 0));
}

.vermelho {
 position: fixed;   
left: 0px;
bottom: 60px;
width: 100%;
height: 60px;
background-color: rgb(195, 6, 6);
}
.branco {
position: fixed;
left: 0px;
bottom: 40px;
width: 100%;
height: 40px;
background-color: rgb(255, 255, 255);
}

.preto {
position: fixed;   
left: 0px;
bottom: 0px;
width: 100%;
height: 40px;
background-color: rgb(0, 0, 0);
}
nav {background-color: #770000; width: 100%;}
ul {
  margin-left: 575px;
  margin-right: 575px;
  list-style-type: none;
  margin: 100;
  padding: 100;
  overflow: hidden;
  background-color: #ffffff;
}

ul li {
  float: left;
}

ul li a {
  display: block;
  color: rgb(0, 0, 0);
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.text {
  color: rgb(255, 255, 255);
  text-align: center;
  margin-bottom: 100px;
  font-size: 32px;
}

.index0 {
  width: 150px;
height: 200px;
margin-left: 50px;
margin-bottom: 200px;
}

.index1 {
  width: 450px;
height: 300px;
margin-left: 50px;
margin-bottom: 200px;
}
.index2 {
  width: 450px;
height: 300px;
margin-left: 15px;
margin-bottom: 200px;
}
.index3 {
  width: 450px;
height: 300px;
margin-left: 15px;
margin-bottom: 200px;
}

.index4 {
  width: 150px;
height: 200px;
margin-left: 50px;
margin-bottom: 200px;
}