Bug 36390: Two minor OPAC CSS fixes

This patch makes corrections to OPAC CSS to address two small issues.

To test, apply the patch and rebuild the OPAC CSS.

- Perform a catalog search which will return multiple results..
- In the table of search results, check the icon and text for the
  controls under each title: "Place hold", "Add tag", "Add to cart" etc.
  - The colors should be consistent, with a slightly darker blue for the
    icons.
- Scroll down until the table header "sticks" to the top of the
  viewport.
- There should be no gap between the header row with the pagination
  links and the row with the "Select all", "Clear all", etc. controls.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 09119cf9c5)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit eee4ebf0e7)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

koha-tmpl/opac-tmpl/bootstrap/css/src/opac.scss

@@ -517,14 +517,16 @@ th {
 
         &:hover {
             i {
-                &.fa {
+                &.fa,
+                &.fa-solid {
                     color: #338468;
                 }
             }
         }
 
         i {
-            &.fa {
+            &.fa,
+            &.fa-solid {
                 color: #4466AE;
             }
         }
@@ -534,7 +536,8 @@ th {
                 color: #900;
 
                 i {
-                    &.fa {
+                    &.fa,
+                    &.fa-solid {
                         color: #C60000;
                     }
                 }
@@ -548,7 +551,8 @@ th {
 
             &:hover {
                 i {
-                    &.fa {
+                    &.fa,
+                    &.fa-solid {
                         color: #333;
                         opacity: .65;
                     }
@@ -1160,7 +1164,6 @@ fieldset {
     border-bottom: none;
     display: flex;
     margin: 0;
-    margin-top: 3px;
     padding-left: 10px;
     padding-top: .5em;
     flex-wrap: wrap;