set monospace font for the whole page

styles.css

@@ -14,12 +14,15 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
+html {
+	font-family: monospace;
+}
+
 #calculator {
 	display: grid;
 	grid-template-columns: repeat(4, 1fr);
 	gap: 0.3rem;
 	font-size: xx-large;
-	font-family: monospace;
 }
 
 input {
@@ -117,6 +120,5 @@ footer {
 	display: flex;
 	justify-content: center;
 	font-size: small;
-	font-family: monospace;
 	margin: 5%;
 }