style.css

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: 'Quicksand', sans-serif;
    font-weight: bolder;
}

.container {
    text-align: center;
    width: 50%;
    padding: 30px;
    background-color: #f2f2f2;
    border-radius: 10px;
    box-shadow: 0px 0px 10px 0px #bbb;
}

form {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 30px;
}

label, input[type="text"], button[type="button"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 20px;
    font-size: 18px;
    box-sizing: border-box;
    border-radius: 5px;
    border: 1px solid #ccc;
}

label { 
    text-align: left;
    border: none;
}

button[type="button"] {
    background-color: black;
    color: white;
    cursor: pointer;
}

#qr-code {
    width: 350px;
    height: 350px;
    margin: auto;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    box-shadow: 0px 0px 22px 0px #bbb;
}

#qr-code img {
    width: 100%;
    height: 100%;
}

.footer {
  background-color: black;
  color: white;
  text-align: center;
  margin-bottom: -55px;
  padding: 10px;
  position: absolute;
  bottom: 0;
  width: 100%;
  text-decoration: none;
}

.footer > a {
    text-decoration: none;
    color: lightgreen;

}