estilo.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

body{
    background-color:#1E1E1E;
    font-family: 'Poppins';
    display: flex;
    flex-direction: column;
    align-items: center;
    margin:0px;
    padding:0px;
}

header{
    color:white;    
    text-align: center;
    margin:50px;
}

header img{
    width: 100px;
}

form{
    color:white;
    display: flex;
    flex-direction: column;
    width:400px;
    font-size:8pt;
}

form input{
    height:30px;
    border-radius: 10px;
    border:0px;
    margin:5px 0px 20px 0px;
}
    form input::placeholder{
        padding:10px;
    }

form input[type="submit"]{
    background-color: #0C70F2;
    border-radius: 5px;
    color:white;
    font-weight: bold;
}

@media screen and (max-width:480px){
    form{
        width:250px;
    }
}