feat: fix header style

src/fellchensammlung/static/fellchensammlung/css/styles.css

@@ -7,9 +7,6 @@ html, body {
     margin: 20px;
 }
 
-.sidebar-nav {
-    margin-top: 20px;
-}
 
 .col-sm-2 {
     padding-left: 0px;
@@ -53,10 +50,9 @@ h1 {
     border-radius: 4px;
 }
 
-.header a {
+.header a, form {
     float: left;
-    padding: 12px;
-    font-size: 20px;
+    padding: 5px 12px 5px 12px;
     line-height: 25px;
 }
 
@@ -71,7 +67,7 @@ h1 {
 }
 
 .header-right select {
-    width: 75%;
+    width: 100%;
     padding: 8px 10px;
     border: none;
     border-radius: 4px;