*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.buttons{
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 10px;
    
}
#red{
    background-color: red;
}
#green{
    background-color: green;
}
#blue{
    background-color: blue;
}
#yellow{
    background-color: yellow;
}
.container{
    width: 100vw;
    height: 100vh;
    display: flex;
    
    align-items: center;
    justify-content: center;
    bg
}