*{
    box-sizing: border-box;
}

html, body {
    max-width: 100%;
    overflow-x: hidden;
}
.abc{
    width: 100%;
    height: 100vh;
    color: #fff;
    background: linear-gradient(-45deg,#EE7752,#E73C7E,#23A6D5,#23D5AB); 
    background-size: 400% 400%;
    position: relative;
    animation: change 5s ease-in-out infinite;
}

#navbar {
    overflow: hidden;
    background-color: #333;
  }
  
  #navbar a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
  }
  
  #navbar a:hover {
    background-color: #ddd;
    color: black;
  }
  
  #navbar a.active {
    background-color: #04AA6D;
    color: white;
  }
  

@keyframes change{
    0%{
        background-position: 0 50%;
}
    50%{
        background-position: 100% 50%;
}
    100%{
        background-position: 0 50%;
}
}

section{
    width: 100%;
    height: 100vh;
    color: #fff;
    background: linear-gradient(-45deg,#EE7752,#E73C7E,#23A6D5,#23D5AB); 
    background-size: 400% 400%;
    position: relative;
    animation: change 10s ease-in-out infinite;
}

@keyframes change{
    0%{
        background-position: 0 50%;
}
    50%{
        background-position: 100% 50%;
}
    100%{
        background-position: 0 50%;
}
}