*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    background-color: aliceblue;
}
html{
    font-size: 62.5%;
}
.container{
    display: flex;
    flex-wrap: wrap;
}
.c1, .c2, .c3, .c4, .c5, footer{
    width: 100%;
    min-width: 150px;
    height: 150px;
}
.c1{
    background-color:#A6243C;
}
.c2{
    background-color:#4F7319;
}
.c3{
    background-color:#7BA61F;
}
.c4{
    background-color:#D9A23D;
}
.c5{
    background-color:#A66C4B;
}
footer{
    background-color: papayawhip;
}