*{
    font-family: Verdana;
    padding: 0;
    margin: 0;
}
body{
    width: 100vw;
    height: 100vh;
}
#main{
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}
input[type=text]{
    width: 50px;
    margin-left: 15px;
    padding: 5px 0;
    border: 0;
    text-align: center;
}
input[type=checkbox]{
    width: 20px;
    height: 20px;
}
button{
    padding: 5px;
    color: white;
    background-color: #0075ff;
    border: 0;
    font-weight: bold;
    letter-spacing: 1px;
}
button:active{
    background-color: #f03a17;
}