.htmleditor {
    background-color: #fff;
    width: calc(100% - 26px);
    height: 31em;
    border: 1px solid black;
    margin: 7px;
    padding: 5px;
    overflow: auto;
}
  
.htmleditor table {
    border: 1px solid #e0e0e0;
    border-collapse: collapse;
}
  
.htmleditor th {
    border: 1px solid #e0e0e0;
}
  
.htmleditor td {
    border: 1px solid #e0e0e0;
}