*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body{
    background: #dcdcdc;
}

.a{
    background: #d1a514;
    border: solid 2px black;
    min-height: 100px;

    display: flex;
    justify-content: center;
    align-items: center;
}

.B{
    background: #5a045a;
    border: solid 2px black;
    min-height: 100px;

    display: flex;
    justify-content: center;
    align-items: center;
}