*{
    font-family: sans-serif;
}

body{
    max-width: 600px;
    max-height: 600px;
    margin: 0 auto;
    background-color: yellow;
}

.container{
    background-color: white;
    border-radius: 30px;
    text-align: center;
    height: 500px;
}

.header{
    background-color: rgba(51,54,97,1);
    width: 600px;
    height: 50px;
    border-radius: 30px 30px 0 0;
}

h1{
    padding-top: 70px;
}

input{
    width: 50%;
    height: 25px;
    font-size: 25px;
    padding: 10px;
}

button{
    width: 50%;
    padding: 10px;
    border: 2px solid blue;
    background-color: blue;
    color: white;
    margin: 20px auto;
    border-radius: 5px;
    cursor: pointer;
}

button:hover{
    background-color: white;
    color: blue;
}

#feedback{
    color: red;
    margin: 5px auto;
}