styles.css

* {
    margin: 0;
}

body {
    background-color: grey;
}

.container {
    width: 400px;
    padding: 25px 35px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 10px;
    background: White;
}

.container p {
    font-size: 15px;
    margin: 0 0 10px;

}

.container input {
    border: 1px solid black;
    padding: 10px;
    width: 100%;
    height: 9px;
    cursor: text;
}

.container button {
    border: 0;
    background: #4caf50;
    display: block;
    margin: 20px auto auto auto;
    text-align: center;
    border: 2px solid #4caf50;
    padding: 14px 40px;
    outline: none;
    color: white;
    border-radius: 24px;
    transition: 0.25s;
    cursor: pointer;
}

#qr img {
    width: 50%;
    height: 50%;
    display: block;
    margin: 20px auto;


}