style.css

html {
    font-family: sans-serif;
}

body {
    margin: 0;
    display: flex;
    justify-content: center;
    background-color: #212121;
}

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

h1 {
    background-color: #161616;
    margin-top: 0;
    font-size: 1.5rem;
}

p {
    font-size: 16px;
}

#guessField {
    color: #000;
    width: 250px;
    height: 50px;
    font-size: 30px;
    margin-top: 25px;
    border: 5px solid #6c6d6d;
}

#guess {
    font-size: 50px;
}

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

#subt:hover{
    cursor: pointer;
}

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

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