body {
    background-color: #333;
}

.linum {
    display: inline-block;
    width : 1.5%;
    height: 100%;
    background-color: #f6f6f6;
    color:black;
    padding-top: 20px;
    font-size:15px;
    overflow:hidden;
}

.editor {
    display: inline-block;
    width: 50%;
    height: 100%;
    border: none;
    border-right: 1px solid #ccc;
    resize: none;
    outline: none;
    background-color: #f6f6f6;
    font-size: 15px;
    font-family: 'Monaco', courier, monospace;
    padding-top: 20px;
    padding-left: 20px;
}

.preview {    
    display: inline-block;
    width: 40%;
    position: absolute;
    padding-top: 20px;
    padding-left: 50px;
    color:white;
    font-size: 20px;
}