*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

:root{
    --unit: calc(1vw * 1vh);  /* 5 vmin*/
}

body{
    height: 100vh;
    background-color: blue;
    display: flex;
    justify-content: center;
    align-items: center;
}

main{
    display: flex;
    justify-content: center;
    align-items: center;
    gap: calc(10vh) 15px;
    flex-wrap: wrap;
    
}

.letter{
    border: 1px solid aqua;
    border-radius: 15px;
    width: clamp(40px, calc(--unit), 100px); /* var()*/
    height: clamp(80px, calc(--unit * 2), 200px);
    color: white;
    font-size: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

h1{
    width: 100%;
    color: white;
    text-align: center;
}

#form_cont{
    width: 100%;
}

#form{
    color: white;
    border: 3px solid beige;
    width: 500px;
    height: 100px;
    margin: 0 auto;
}