Improve project header css

assets/sass/_project_header.sass

@@ -2,42 +2,24 @@
 @import mixins
 
 .project-header
-  @include grid(100)
   margin-bottom: 8px
 
   .dropdown-component
     margin-top: 4px
-    @include grid_width(5/100)
-    @include md-device
-      @include grid_width(8/100)
+    margin-right: 5px
+    float: left
+
     @include sm-device
-      @include grid_width(1)
+      float: none
 
   .views-switcher-component
     margin-top: 4px
-    @include grid_width(38/100)
-    @include custom-device(1300px)
-      @include grid_width(45/100)
-    @include md-device
-      @include grid_width(92/100)
+    float: left
+
     @include sm-device
-      margin-top: 0
-      @include grid_width(1)
+      float: none
+      margin-bottom: 10px
 
   .filter-box-component
-    margin: 0
-    @include grid_width(55/100)
-    @include custom-device(1300px)
-      @include grid_width(50/100)
-    @include md-device
-      @include grid_width(1)
-      margin-top: 10px
-      .filter-box
-        max-width: 100%
-    @include sm-device
-      @include grid_width(1)
-      margin-top: 10px
-      .filter-box
-        max-width: 100%
     form
       margin: 0