Alves: use font-base for buttons

alves/style-editor.css

@@ -300,7 +300,7 @@ object {
 	color: #ffffff;
 	font-weight: bold;
 	font-family: "Karla", Arial, sans-serif;
-	font-family: var(--font-headings, "Karla", Arial, sans-serif);
+	font-family: var(--font-base, "Karla", Arial, sans-serif);
 	font-size: 1.04167em;
 	line-height: 1;
 	background-color: #3E7D98;

alves/style-rtl.css

@@ -1082,7 +1082,7 @@ input[type="submit"],
 	cursor: pointer;
 	font-weight: bold;
 	font-family: "Karla", Arial, sans-serif;
-	font-family: var(--font-headings, "Karla", Arial, sans-serif);
+	font-family: var(--font-base, "Karla", Arial, sans-serif);
 	font-size: 1.04167rem;
 	background-color: #3E7D98;
 	border-radius: 160px;

alves/style.css

@@ -1082,7 +1082,7 @@ input[type="submit"],
 	cursor: pointer;
 	font-weight: bold;
 	font-family: "Karla", Arial, sans-serif;
-	font-family: var(--font-headings, "Karla", Arial, sans-serif);
+	font-family: var(--font-base, "Karla", Arial, sans-serif);
 	font-size: 1.04167rem;
 	background-color: #3E7D98;
 	border-radius: 160px;