style.css

body{
    height: 0 auto;
    width: 0 auto;
    background-color:black;
    background: url('../img/fritas.jpg') no-repeat;
}

.content{
    padding: 20px;
    background: #fff;
    color: #303030;
    border-radius: 15px;
    width: 400px;
    height: 480px;
    margin-right: auto;
    margin-top: 70px;
    font-family: Arial, Helvetica, sans-serif;
}

.content h1{
    font-size: 35px;
    line-height: normal;
}

.content p{
    font-size: 14px;
}

.content  form{
    padding: 10px;
    flex-direction: column;
    margin-top: 30px;
}

.content form input{
    border-radius: 8px;
    border: 0.5px solid #303030;
    padding: 10px;
    display: flex;    
    width: 7cm; 
    margin-bottom: -10px;
    height: 0.8cm;
}

.btn{
    border: 0;
    width: 6cm;
    height: 1.2cm;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 20px;
    font-weight: 20px;
    border-radius: 10px;
    color: #fff;
    background: #F71E1E;
    cursor: pointer;
}

.btn:hover{
    background: #F73E1E;
}