*{
    padding: 0; 
    margin: 0;
    box-sizing: border-box;
}
body{
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: white;
}
@keyframes color {
    0%{
        background-color: #061643;
    }
    25%{
        background-color: #020A22;
    }
    50%{
        background-color: #061643;

    }
    75%{
        background-color: #001347;
    }
    100%{
        background-color: #061643;
    }
}

.S{

    background-color: #061643;
    display: flex;
    align-items: center;
    justify-content: space-between;
    animation: color 90s ease infinite;
}

.b1{
    background-image: linear-gradient(90deg,#08011b, #12095A);
}
.b2{
    background-image: linear-gradient(90deg,#12095A, #08011b);
}
.b1, .b2{
    width: 20%;
    height: 20%;
    
}

@media only screen and (max-width: 600px){
    .S{
        width: 450px;
        height: 450px;

      }

}

@media only screen and (min-width: 601px){
    .S{
        width: 500px;
        height: 500px;

      }

      
}

@media only screen and (min-width: 1200px){
    .S{
    width: 600px;
    height: 600px;
  }

  
}