body{
    text-align: center;
    justify-content: center;
}
.container{
    display: flex;
    justify-content: center;
}

.box{
    height: 200px;
    width: 200px;
    border: 7px black solid;
    margin: 3rem;
    border-radius: 2rem;
}
.one{
    background-color: aqua;
}
.two{
    background-color: brown;
}
.three{
    background-color: chartreuse;
}
.four{
    background-color: blueviolet;
}
.blink{
    background-color: wheat;
}