update font

src/style/_variables.scss

@@ -1,4 +1,5 @@
 $primary: #2ecc71;
 $tabs-link-active-color: #3498db;
 $tabs-link-active-border-bottom-color: #3498db;	
+$family-sans-serif: 'Fira Sans', sans-serif;
 @import "~bulma/sass/utilities/_all.sass";

src/style/style.scss

@@ -1,4 +1,5 @@
 @charset "utf-8";
+@import url('https://fonts.googleapis.com/css?family=Fira+Sans&display=swap');
 html, body {
     height: 100%;
 }