+.content-width-minus-button {
+ background-size: 42px 16px;
+ background-image: url("chrome://global/skin/reader/RM-Content-Width-Minus-42x16.svg");
+}
+
+.content-width-plus-button {
+ background-size: 44px 16px;
+ background-image: url("chrome://global/skin/reader/RM-Content-Width-Plus-44x16.svg");
+}
+
+.line-height-minus-button {
+ background-size: 34px 14px;
+ background-image: url("chrome://global/skin/reader/RM-Line-Height-Minus-38x14.svg");
+}
+
+.line-height-plus-button {
+ background-size: 34px 24px;
+ background-image: url("chrome://global/skin/reader/RM-Line-Height-Plus-38x24.svg");
+}
+