body{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: rgb(129, 151, 151);
    text-align: center;
}
.div-container{
    display: flex;
    justify-content: center;
}
.box{
    height: 150px;
    width: 150px;
    border: 5px solid black;
    margin: 2rem;
    border-radius: 20%;
    cursor: pointer;
    
}
.red{
    background-color: red;
}
.yellow{
    background-color: yellow;
}
.green{
    background-color: green;
}
.blue{
    background-color: blue;
}
.flash{
    background-color: black;
}
.user-flash{
    background-color: white;
}