diff --git a/src/app/components/home/home-page/home-page.component.html b/src/app/components/home/home-page/home-page.component.html
index 6d28ae20688097763bad6438753e7762a1c2ecff..1dd0a5f09cc4fe2d21215e8116cfebe1a0b9c68f 100644
--- a/src/app/components/home/home-page/home-page.component.html
+++ b/src/app/components/home/home-page/home-page.component.html
@@ -14,7 +14,7 @@
   </div>
 
   <img tabindex="-1"
-       src="/assets/background/auditorium.png"
+       src="/assets/background/auditorium.webp"
        class="screenshot"
        width="1280"
        height="292"
diff --git a/src/app/components/shared/questionwall/question-wall/question-wall.component.scss b/src/app/components/shared/questionwall/question-wall/question-wall.component.scss
index 0e89b1a7cd63f17d7950b54ecca6fe15d542381b..d94120f74b9e3d10fbe6eee793f38cf6247376da 100644
--- a/src/app/components/shared/questionwall/question-wall/question-wall.component.scss
+++ b/src/app/components/shared/questionwall/question-wall/question-wall.component.scss
@@ -268,7 +268,7 @@
     color: yellow;
 
     hr {
-      border: 2px solid yellow;
+      border: 1px solid yellow;
     }
 
     img {
diff --git a/src/assets/background/auditorium.webp b/src/assets/background/auditorium.webp
new file mode 100644
index 0000000000000000000000000000000000000000..7dbc6b325d4057eab002c64e1d103030b478f3b8
Binary files /dev/null and b/src/assets/background/auditorium.webp differ
diff --git a/src/assets/i18n/demo/demo-de.html b/src/assets/i18n/demo/demo-de.html
index 41d9a37712a36c99dd24d50bc86933f064d3a801..9bcd3d53c66a7e9ed2b7fe3af3ea690fc71fe625 100644
--- a/src/assets/i18n/demo/demo-de.html
+++ b/src/assets/i18n/demo/demo-de.html
@@ -1,7 +1,7 @@
 <h2 tabindex="0">»Haben Sie Fragen?«</h2>
 
 <img tabindex="-1"
-     src="/assets/background/auditorium.png"
+     src="/assets/background/auditorium.webp"
      class="screenshot"
      width="1280"
      height="292"
@@ -213,7 +213,7 @@
 
 <h2 tabindex=0>Icons und Buttons</h2>
 
-<img tabindex=-1 src="/assets/images/poster.jpg"
+<img tabindex=-1 src="/assets/images/poster.webp"
      class="screenshot"
      width="907"
      height="1280"
@@ -221,7 +221,7 @@
 
 <h2 tabindex="0">Fragenboard aus Teilnehmersicht</h2>
 
-<img tabindex=-1 src="/assets/images/participant.png"
+<img tabindex=-1 src="/assets/images/participant.webp"
      class="screenshot"
      width="400"
      height="805"
@@ -263,7 +263,7 @@
 
 <h2 tabindex="0">Sitzungsverwaltung aus Dozentensicht</h2>
 
-<img tabindex=-1 src="/assets/images/lecturer.png"
+<img tabindex=-1 src="/assets/images/lecturer.webp"
      class="screenshot"
      width="800"
      height="600"
diff --git a/src/assets/i18n/demo/demo-en.html b/src/assets/i18n/demo/demo-en.html
index 922313fa59fba457eb2163cca3bedd139d0e2314..cbac1bc9bb5091f44a2f01a2d21168d836f3aa3e 100644
--- a/src/assets/i18n/demo/demo-en.html
+++ b/src/assets/i18n/demo/demo-en.html
@@ -3,7 +3,7 @@
 </h2>
 
 <img tabindex="-1"
-     src="/assets/background/auditorium.png"
+     src="/assets/background/auditorium.webp"
      class="screenshot"
      width="1280"
      height="292"
@@ -223,7 +223,7 @@
 
 <h2 tabindex=0>Icons and buttons</h2>
 
-<img tabindex=-1 src="/assets/images/poster.jpg"
+<img tabindex=-1 src="/assets/images/poster.webp"
 class="screenshot"
 width="907"
 height="1280"
@@ -231,7 +231,7 @@ alt="Info poster about frag. jetzt">
 
 <h2 tabindex="0">Question board from the view of a participant</h2>
 
-<img tabindex=-1 src="/assets/images/participant.png"
+<img tabindex=-1 src="/assets/images/participant.webp"
      class="screenshot"
      width="400"
      height="805"
@@ -274,7 +274,7 @@ alt="Info poster about frag. jetzt">
 
 <h2 tabindex="0">Session management</h2>
 
-<img tabindex=-1 src="/assets/images/lecturer.png"
+<img tabindex=-1 src="/assets/images/lecturer.webp"
      class="screenshot"
      width="800"
      height="600"
diff --git a/src/assets/i18n/imprint/imprint-de.html b/src/assets/i18n/imprint/imprint-de.html
index 5ab4ca629968186e53d9217bf40b2b34ddbfd186..36e9af24f3e5e3adba0f9b9698915f4e27b1481e 100644
--- a/src/assets/i18n/imprint/imprint-de.html
+++ b/src/assets/i18n/imprint/imprint-de.html
@@ -5,7 +5,7 @@
 <a href="https://www.digll-hessen.de/de"
    class="info"
    target="_blank">
-  <img src="/assets/images/HMWK.png"
+  <img src="/assets/images/HMWK.webp"
        alt="HMWK-Logo"
        width="150"
        height="64">
diff --git a/src/assets/i18n/imprint/imprint-en.html b/src/assets/i18n/imprint/imprint-en.html
index 0defb4ed39398ec12b94b0104ac5f9b730215653..4acf01342f819744455615c54cd2d888af9939d1 100644
--- a/src/assets/i18n/imprint/imprint-en.html
+++ b/src/assets/i18n/imprint/imprint-en.html
@@ -5,7 +5,7 @@
 <a href="https://www.digll-hessen.de/de"
    class="info"
    target="_blank">
-  <img src="/assets/images/HMWK.png"
+  <img src="/assets/images/HMWK.webp"
        alt="HMWK-Logo"
        width="150"
        height="64">
diff --git a/src/assets/images/HMWK.png b/src/assets/images/HMWK.png
deleted file mode 100644
index 0168b696454bc9fec3d7485b00177746233858fe..0000000000000000000000000000000000000000
Binary files a/src/assets/images/HMWK.png and /dev/null differ
diff --git a/src/assets/images/HMWK.webp b/src/assets/images/HMWK.webp
new file mode 100644
index 0000000000000000000000000000000000000000..1c12c1618dfd11dbe7c421697b99dcca16c234a6
Binary files /dev/null and b/src/assets/images/HMWK.webp differ
diff --git a/src/assets/images/digLL.png b/src/assets/images/digLL.png
deleted file mode 100644
index aa6723fe10a036c8dace509bc6230669d27b5774..0000000000000000000000000000000000000000
Binary files a/src/assets/images/digLL.png and /dev/null differ
diff --git a/src/assets/images/lecturer.png b/src/assets/images/lecturer.png
deleted file mode 100644
index 8cfd953c6b5f31cb7c8cde619bf361829fffc47b..0000000000000000000000000000000000000000
Binary files a/src/assets/images/lecturer.png and /dev/null differ
diff --git a/src/assets/images/lecturer.webp b/src/assets/images/lecturer.webp
new file mode 100644
index 0000000000000000000000000000000000000000..9fb8ca1ebade87356a60f885fbf4ac5619e86f76
Binary files /dev/null and b/src/assets/images/lecturer.webp differ
diff --git a/src/assets/images/participant.png b/src/assets/images/participant.png
deleted file mode 100644
index bb597d9fd01280a4cb8d3811694bf647a3e202b0..0000000000000000000000000000000000000000
Binary files a/src/assets/images/participant.png and /dev/null differ
diff --git a/src/assets/images/participant.webp b/src/assets/images/participant.webp
new file mode 100644
index 0000000000000000000000000000000000000000..86b97bae03b38e830b6bcc99130e9fb34234db68
Binary files /dev/null and b/src/assets/images/participant.webp differ
diff --git a/src/assets/images/poster.jpg b/src/assets/images/poster.jpg
deleted file mode 100644
index 8f5196cf569f26e452c4f6bbbcc0c6854fa19212..0000000000000000000000000000000000000000
Binary files a/src/assets/images/poster.jpg and /dev/null differ
diff --git a/src/assets/images/poster.webp b/src/assets/images/poster.webp
new file mode 100644
index 0000000000000000000000000000000000000000..d0b34e7b6b88efc3e03c683a57a7583eec07f93c
Binary files /dev/null and b/src/assets/images/poster.webp differ