style.css

*{
    padding: 0px;
    margin: 0px;
}
.box1{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 50vh;
    background-color: royalblue;
}
.box2{
    font-size: 100px;
    background-color: yellow;
    height: 343px ;
}
#b7,#b8,#b9{
    font-size: 100px;
    height: 100px;
    width: 100px;
    background-color: royalblue;
    border-color: royalblue;
    color: black;
}
#b1,#b2,#b3,#b4,#b5,#b6{
    font-size: 100px;
    height: 100px;
    width: 100px;
    background-color:royalblue;
    border-color: royalblue;
    color: black;

}
h1{
    text-align: center;
    padding-top: 30px;
}
#start{
    margin-left: 720px;
    height: 30px;
    width: 50px;
}
#h2{
    text-align: center;
}
.start1{
    height: 50px;
    width: 50px;
    font-size: 40px;
    margin-left: 650px;
}
.start2{
    margin-left: 85px;
    height: 50px;
    width: 50px;
    font-size: 40px;
}
.h3{
    text-align: center;
}