Fix font-weight issues

Author: vctrfrnndz

lib/typography/index.styl

@@ -4,7 +4,7 @@ h1, h2, h3, h4, h5, h6
   font-family: font-sans-serif
   font-weight: font-weight-normal
   line-height: line-height-titles
-  margin: padding-vertical 0
+  margin: 1.8rem 0
 
   a
     color: color-text-black
@@ -21,7 +21,7 @@ h5, .h5, h6, .h6
   font-size: font-size-h5
 
 p
-  margin: padding-vertical 0
+  margin: 1rem 0
   line-height: line-height
 
   &.caption

lib/vars/index.styl

@@ -16,8 +16,8 @@ font-size-h3 = 1.5rem
 font-size-h4 = 1.3rem
 font-size-h5 = font-size-base
 
-font-weight-light = 200
-font-weight-normal = normal
+font-weight-light = 300
+font-weight-normal = 400
 font-weight-bold = 600
 
 line-height = 1.728571429