style.css

*{
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
}

body {
    background: black;
    display: flex;
    justify-content: center;
    text-align: center;
}

div {
    background: darkslateblue;
    padding: 20px;
    border-radius: 10px;
    margin-top: 40vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h2 {
    color: aliceblue;
    margin-bottom: 10px;
}

.tamanhoSenha {
    max-width: 40px;
    text-align: center;
}

.campoGerado {
    min-width: 250px;;
    text-align: center;
    font-weight: 900;
}

.bxTamanho {
    color: aliceblue;
    font-style: italic;
    margin-bottom: 3px;
    margin-top: 20px;
}

.botaoGerar {
    padding: 8px;
    color: black;
    background: greenyellow;
    font-weight: bold;
    font-family:Verdana, Geneva, Tahoma, sans-serif;
    margin-top: 30px;
    outline: none;
}

.botaoGerar:hover {
    background: gold;
}