Revert "Custom style for Gala 2025"

This reverts commit 8cbf42d714.

core/static/core/footer.scss

@@ -65,7 +65,7 @@ footer.bottom-links {
       flex-wrap: wrap;
       align-items: center;
       background-color: $primary-neutral-dark-color;
-      box-shadow: black 0 8px 15px;
+      box-shadow: $shadow-color 0 0 15px;
 
       a {
         color: $white-color;

core/static/core/header.scss

@@ -11,8 +11,7 @@ $hovered-red-text-color: #ff4d4d;
 .header {
   box-sizing: border-box;
   background-color: $deepblue;
-  box-shadow: black 0 1px 3px 0,
-              black 0 4px 8px 3px;
+  box-shadow: 3px 3px 3px 0 #dfdfdf;
   border-radius: 0;
   width: 100%;
   display: flex;
@@ -100,7 +99,7 @@ $hovered-red-text-color: #ff4d4d;
         border-radius: 0;
         margin: 0;
         box-sizing: border-box;
-        background-color: transparent;
+        background-color: $deepblue;
         width: 45px;
         height: 25px;
         padding: 0;
@@ -332,7 +331,7 @@ $hovered-red-text-color: #ff4d4d;
           padding: 10px;
           z-index: 100;
           border-radius: 10px;
-          @include shadow;
+          box-shadow: 3px 3px 3px 0 #767676;
 
           >ul {
             list-style-type: none;

core/static/core/style.scss

@@ -271,9 +271,8 @@ body {
 
   /*--------------------------------CONTENT------------------------------*/
   #content {
-    padding: 1.5em 2%;
-    border-radius: 5px;
-    box-shadow: black 0 8px 15px;
+    padding: 1em 1%;
+    box-shadow: $shadow-color 0 5px 10px;
     background: $white-color;
     overflow: auto;
   }

core/templates/core/base.jinja

@@ -44,18 +44,6 @@
 
       {% block additional_css %}{% endblock %}
       {% block additional_js %}{% endblock %}
-      <style>
-        {# background image must be declared here, because the static names are
-           changed during the static collection step,
-           which means we must gather them with the `static` template function #}
-        .header {
-          background-image: url("{{ static("core/img/gala25_background.webp") }}");
-          background-position-y: 80%;  {# There are more stars in this part of the picture #}
-        }
-        body {
-          background-image: url("{{ static("core/img/gala25_background.webp") }}");
-        }
-      </style>
     {% endblock %}
   </head>
 

core/templates/core/base/header.jinja

@@ -1,6 +1,6 @@
 <header class="header">
   <div class="header-logo">
-    <a class="header-logo-picture" href="{{ url('core:index') }}" style="background-image: url('{{ static("core/img/gala25_logo.webp") }}')">
+    <a class="header-logo-picture" href="{{ url('core:index') }}" style="background-image: url('{{ static('core/img/logo_no_text.png') }}')">
       &nbsp;
     </a>
     <a class="header-logo-text" href="{{ url('core:index') }}">