#editor { 
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}
.editor-div {
    position: relative;
    width: 100%;
    height: 100%;
}
.flex-container {
      display: flex;
      flex-wrap: nowrap;
      height: 100%;
}
#preview {
    margin-top: 10px;
    border: 1px solid green;
    background: #ffffff;
    width: 100%;
    height: 100%;
}
.w50per {
    width: 100%;text-align: center;display: block; margin:5px;
    width: 50%;
}
.nav {
    background: #053c75;
    color: #fff;
    position: fixed;
    top: 0px;
    width: 100%;
    left: 0px;
    font-weight: 600;
    text-align: center;
    padding: 5px;
    z-index: 5;
}

.tab {
    display: inline-block;
    padding: 5px;
    border: 1px solid;
}
.link {
    text-decoration: underline;
    color: blue;
    cursor: pointer;
}