html,body{
    margin:0;
    padding: 0;
    box-sizing: border-box;
}
nav{
    width: 100%;
    height: 65px;
    background-color: black;
}
main{
    width: 100vw;
    height: 100vh;
    background-color: red;
    display: flex;
}
#editor{
    width: 50%;
    height: 100%;
    resize: none;
    outline: none;
}