change font family and letter spacing

Author: Lhcfl

source/css/style.styl

@@ -15,7 +15,7 @@ html[id='theme-dark-mode'] img
 
 body
 	color: var(--primary-high)
-	font-family: 'PingHei', 'PingFang SC', Helvetica Neue, 'Work Sans', 'Hiragino Sans GB', 'Microsoft YaHei', SimSun, sans-serif
+	font-family: Helvetica, Arial, 'PingHei', 'PingFang SC', Helvetica, 'Work Sans', 'Hiragino Sans GB', 'Microsoft YaHei', SimSun, sans-serif
 	font-size: 15px
 	width: 100%
 	margin: 0 auto 30px auto
@@ -337,7 +337,6 @@ a:hover, a:active
 
 		a
 			text-decoration: none
-			letter-spacing: 1px
 			color: var(--secondary-350)
 
 			&:hover
@@ -346,7 +345,6 @@ a:hover, a:active
 	.post-content
 		a
 			text-decoration: none
-			letter-spacing: 1px
 			color: #4786D6
 
 		a:hover