new layout

src/editor.html

 				padding-bottom: 0px;
 				overflow-y: scroll;
 				-webkit-overflow-scrolling: touch;
-				height: 100%;
+				height: calc(100vh);
+				display: flex;
+				flex-direction: column;
 			}
 
 			img {
 				padding-right: 10px;
 				line-height: 20px;
 				caret-color:rgb(90, 149, 211);
-				margin-bottom: 100px;
+				flex: 1;
 			}
 
 			#zss_editor_title {