thanks for you reply so quikly.
i have read how to creat child themes.
and i added the MH child theme and actived the child theme.
but the css has some error.
/*
Theme Name: MH Magazine lit Child
Theme URI: https://www.mhthemes.com/
Description: MH Theme Css
Author: MH Theme
Author URI: https://www.mhthemes.com/
Template: mh-magazine-lite
Version: 1.0.0
*/
@import url("../mh-magazine-lite/style.css");
/* =Theme customization starts here
-------------------------------------------------------------- */
.entry a:hover {
color: #ff519e;
text-decoration: none;
background-color: #ffe7ee;
border-bottom: 1px dotted #000000;}
.entry img { margin-top:5px;}
.entry .post-thumbnail { display:none;}