* {
    padding: 0;
    margin: 0;
}

.container1 {
    width: 400px;
    height: 400px;
    border: 1px solid transparent;
    margin: 0 auto;
    margin-top: 10%;
    text-align: center;
}

.container1 #code {
    width: 150px;
    text-align: center;
    font-size: 1.6em;
    margin: 0 auto;
    margin-top: 100px;
}

.container1 canvas {
    width: 150px; 
}

.container1 form {
    height: 30px;
    margin: 0 auto;
    margin-top: 60px;
}

.container1 form input {
    height: 30px;
    font-size: 20px;
}

.container1 form span {
    display: inline-block;
    width: 100px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    cursor: pointer;
    border: 1px solid black;
}