set font size to a fixed value

overrides/assets/stylesheets/extra.css

@@ -2,11 +2,39 @@
     --md-primary-fg-color: #06889C;
     --md-accent-fg-color: #4AA44A;
     --md-primary-fg-color--dark: #06889C;
+    --md-typeset-color: #000000;
+    --md-default-fg-color: #000000;
+}
+html {
+    overflow-y: scroll;
+    font-size: 137.5%;
+}
+@media screen and (min-width: 100em) {
+	html {
+		font-size: 137.5%;
+	}
+}
+
+@media screen and (min-width: 125em) {
+	html {
+		font-size: 137.5%;
+	}
 }
 .tx-container {
     --md-accent-fg-color: #4AA44A;
 }
-
+.md-typeset .admonition,.md-typeset details {
+    font-size: .75rem;
+}
+.md-typeset {
+    font-size: .75rem;
+    text-align: justify;
+    line-height: 1.4;
+    -webkit-hyphens: auto;
+    -moz-hyphens: auto;
+    hyphens: auto;
+    color: black;
+}
 .md-typeset table:not([class]) {
     font-size: .75rem;
 }