front/general: change CSS for headers and links

static/css/main.css

@@ -19,18 +19,23 @@ body {
     color: var(--text-color);
     font-family: 'Droid Sans' !important;
     font-size: 12pt;
-    line-height: 20pt;
+    line-height: 18pt;
+}
+
+h1, h2, h3 {
+    font-weight: 400;
 }
 
 a {
     color: var(--main-color);
+    text-decoration: none;
 }
 
 #content-holder {
     margin-top: 1em;
     text-align: center;
 }
-#content-holder>.center {
+#content-holder>.content-wrapper {
     text-align: left;
     display: inline-block;
     margin: 0 auto;
@@ -66,7 +71,6 @@ nav.text-nav {
 }
 nav.text-nav ul li a {
     padding: 0.3em 1.2em;
-    text-decoration: none;
 }
 nav.text-nav ul li:not(.active) a {
     color: var(--inactive-link-color);

static/html/login.tpl

@@ -1,4 +1,4 @@
-<div class='center' id='login'>
+<div class='content-wrapper' id='login'>
     <h1>Log in</h1>
     <form>
         <fieldset class='input'>

static/html/user_registration.tpl

@@ -1,4 +1,4 @@
-<div class='center' id='user-registration'>
+<div class='content-wrapper' id='user-registration'>
     <h1>Registration</h1>
     <form autocomplete='off'>
         <fieldset class='input'>