style.css

/* Programa para Leitura de Notas */

html, body{
    width: 100%;
    max-width: 100vw;
    height: 100%;
    padding: 0;
    margin: 0;
}

body{
    background-color: rgb(87, 100, 216);
}

.general{
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

form {
    text-align: center;
    background-color: white;
    width: 400px;
    height: 200px;
    padding: 10px;
    border-radius: 20px;
}

input, textarea{
    width: 40%;
    margin: 5px;
}

.form-textarea {
    display: block;
    max-width: 300px;
}

button{
    border-radius: 10px;
    padding: 5px;
    margin: 5px;
}

@media(max-width: 800px){
    .form-group{
        min-width: 100%;
    }

    .general{
        display: flex;
        flex-direction: column;
        width: 100%;
    }

    form{
        height: 450px;
    }
    
}