* {
    box-sizing: border-box;
}

body {
    background: #00b4db;
    background: -webkit-linear-gradient(
    bottom,
    #0083b0,
    #00b4db
    );
    background: linear-gradient(
        to bottom,
        #0083b0,
        #00b4db
    );
    color:white;
    font-family:sans-serif;
}

#contener {
    width:1000px;
    margin-left: auto;
    margin-right: auto;
}

h1 {
    text-transform: uppercase;
    text-align:center;
    font-family:sans-serif;
    font-size: 40px;
}

#panel {
    margin-left:auto;
    margin-right:auto;
    width:500px;

}

.textbox:{
    width: 100%;
    padding:10px;
    font-family: sans-serif;
    font-size:20px;
    margin-bottom: 20px;
}

canvas {
    width:100%;
}