style.css

@url(https://fonts.googleapis.com/css?family=Open+Sans:400,300,700);
html {
    background-image: url("img/back.png");
    font-family: 'Open Sans', sans-serif;
}

body {
    display: block;
    width: 333px;
    margin: auto;
    border-radius: 10px;
}

header {
    margin: 10px 0;
    text-align: center;
}

header h1 {
    margin: 0;
    font-weight: 700;
    color: rgb(255, 255, 190);
}

header p {
    margin: 0;
    color: rgb(150,150,100);
    font-weight: 300;
}

main {
    border-radius: 10px;
    background-image: url("img/front.png");
    padding: 5px;    
}

main h1 {
    margin: 0;
}

main p {
    margin: 5px 0; 
}

main form {
    border: 1px solid #ccc;
    border-radius: 10px;
    padding: 5px;
    margin: 0;
}

main input {
    margin: 5px 0;
}

main input[type='password'] {
    border: 1px solid #ccc;
    width: 100%;
}

main label {
    display: block;
}