body {
    margin: 50px;
    padding: 10px;
    width: 92vw;
    background: white;
    display: flex;
    flex-direction: column;
    gap: 50px;
    align-items: center;
}
.divA {
    margin: 0;
    padding: 20px;
    min-width: 200px;
    min-height: 120px;
    background: white;
    border: 3px solid rebeccapurple;
    border-radius: 15px;
}
.divB {
    margin: 0;
    padding: 20px;
    min-width: 200px;
    min-height: 120px;
    font-size: 24pt;
    color: brown;
    background: white;
    border: 3px solid rebeccapurple;
    border-radius: 15px;
}
.divC {
    margin: 0;
    padding: 20px;
    min-width: 200px;
    min-height: 120px;
    font-size: 24pt;
    color: brown;
    background: white;
    border: 3px solid rebeccapurple;
    border-radius: 15px;
}
.inp-sa {
    margin: 0;
    padding: 3px;
    width: 100px;
    min-height: 40px;
    font-size: 22pt;
    color: salmon;
    border-radius: 10px;
}
.btnA {
    margin: 0;
    padding: 5px;
    font-size: 25pt;
    color: green;
    border-radius: 10px;
}