[design] improve form group spacing

Author: zombieFox

src/css/button.css

@@ -5,7 +5,7 @@ input[type="reset"],
 input[type="submit"]{
 background-color:rgb(var(--button-background));
 padding:0.25em1em;
-margin:001em0;
+margin:0;
 color:rgb(var(--button-text));
 font-size:1em;
 font-family:var(--theme-font-ui-name);
@@ -207,11 +207,3 @@ button [class*=" button-"]:last-child,
 background-color: transparent;
 color: transparent;
 }
-
-.button-wrap{
-padding:0.5em0;
-position: relative;
-width:100%;
-display: flex;
-flex-direction: row;
-}