.error{
    border: 1px solid red;
    outline: red;
    box-shadow: 0px 0px 5px red;
}
header{
    padding: 10px 10px 10px;
}
footer{
    padding: 10px 10px 10px;
    clear: both;
}
#content{
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    float: right;
    height: 500px;
    width: calc(100% - 210px);
}
#heading{
    font-size: larger;
    font-weight: 800;
}
#container{
    padding: 10 px;
    background-color: cadetblue;
}