Properly adjust height of terminal rows and child elements

Fix #54

src/xterm.css

@@ -2134,3 +2134,19 @@
 .terminal .xterm-bg-color-255 {
     background-color: #eeeeee;
 }
+
+/**
+ * All terminal rows should have explicitly declared height,
+ * in order to allow child elements to adjust.
+ */
+.terminal .xterm-rows > div {
+    line-height: 1.2;
+}
+
+/**
+ * All styled spans inside terminal lines should be inline-blocks,
+ * in orde to achieve better height adjustment.
+ */
+.terminal .xterm-rows span {
+    display: inline-block;
+}