style.css

html{
    font-family: sans-serif;
}

body{
    width: 300px;
    max-width: 750px;
    min-width: 480px;
    margin: 0 auto;
    background-color: #212121;
}

.lastResult{
    color: white;
    padding: 7px;
}

.guesses{
    color: white;
    padding: 7px;
}

button{
    background-color: #141414;
    color: #fff;
    width: 250px;
    height: 50px;
    border-radius: 25px;
    font-size: 30px;
    border-style: none;
    margin-top: 30px;
}

#subt{
    cursor: pointer;
    background-color: #161616;
    color: #ffffff;
    width: 200px;
    height: 50px;
    border-radius: 10px;
    font-size: 20px;
    border-style: none;
    margin-top: 50px;
}

#guessField{
    color: #000;
    width: 250px;
    height: 50px;
    font-size: 30px;
    border-style: none;
    margin-top: 25px;
    text-align: center;
    border: 5px solid #6c6d6d;
}

#guess{
    font-size: 55px;
    margin-top: 120px;
    color: #fff;
}

.guesses{
    background-color: #7a7a7a;
}

#wrapper{
    box-sizing: border-box;
    text-align: center;
    width: 450px;
    height: 550px;
    background-color: #474747;
    color: #fff;
    font-size: 25px;
}

h1{
    background-color: #161616;
    color: #fff;
    text-align: center;
}

p{
    font-size: 16px;
    text-align: center;
}