diff --git a/workshop.html b/workshop.html
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- *
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- * @author Yuki Hattori
- *
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tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id=":$p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-background-color="#fff" data-background-image="url('https://marp.app/assets/hero-background.svg')" data-class="lead" data-theme="gaia" class="lead" data-marpit-pagination="1" data-marpit-pagination-total="2" style="--paginate:true;--background-color:#fff;--background-image:url('https://marp.app/assets/hero-background.svg');--class:lead;--theme:gaia;background-color:#fff;background-image:url('https://marp.app/assets/hero-background.svg');background-position:center;background-repeat:no-repeat;background-size:cover;--marpit-advanced-background-split:40%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="left"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url(&quot;https://marp.app/assets/marp.svg&quot;);background-size:80%;"></figure></div></section></foreignObject><foreignObject width="60%" height="720" x="40%"><section id="1" data-paginate="true" data-background-color="#fff" data-background-image="url('https://marp.app/assets/hero-background.svg')" data-class="lead" data-theme="gaia" class="lead" data-marpit-pagination="1" data-marpit-pagination-total="2" style="--paginate:true;--background-color:#fff;--background-image:url('https://marp.app/assets/hero-background.svg');--class:lead;--theme:gaia;background-color:#fff;background-image:url('https://marp.app/assets/hero-background.svg');background-position:center;background-repeat:no-repeat;background-size:cover;--marpit-advanced-background-split:40%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="left">
-<h1 id="marp"><strong>Marp</strong></h1>
-<p>Markdown Presentation Ecosystem</p>
-<p><a href="https://marp.app/">https://marp.app/</a></p>
-</section>
-</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section data-paginate="true" data-background-color="#fff" data-background-image="url('https://marp.app/assets/hero-background.svg')" data-class="lead" data-theme="gaia" class="lead" data-marpit-pagination="1" data-marpit-pagination-total="2" style="" data-marpit-advanced-background="pseudo" data-marpit-advanced-background-split="left"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-paginate="true" data-background-color="#fff" data-background-image="url('https://marp.app/assets/hero-background.svg')" data-theme="gaia" data-marpit-pagination="2" data-marpit-pagination-total="2" style="--paginate:true;--background-color:#fff;--background-image:url('https://marp.app/assets/hero-background.svg');--theme:gaia;background-color:#fff;background-image:url('https://marp.app/assets/hero-background.svg');background-position:center;background-repeat:no-repeat;background-size:cover;">
-<h1 id="how-to-write-slides">How to write slides</h1>
-<p>Split pages by horizontal ruler (<code>---</code>). It's very simple! <img class="emoji" draggable="false" alt="😆" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f606.svg" data-marp-twemoji=""/></p>
-<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-markdown"><span class="hljs-section"># Slide 1</span>
-
-foobar
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----
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-<span class="hljs-section"># Slide 2</span>
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\ No newline at end of file
diff --git a/workshop.md b/workshop.md
index c033dac..ac6b3d8 100644
--- a/workshop.md
+++ b/workshop.md
@@ -2,11 +2,11 @@
 theme: gaia
 _class: lead
 paginate: true
-backgroundColor: #fff
-backgroundImage: url('https://marp.app/assets/hero-background.svg')
+backgroundColor: #00437a
+color: #fff
 ---
 
-![bg left:40% 80%](https://marp.app/assets/marp.svg)
+![bg left:40% 80% drop-shadow:0,0,0,#fff](https://iserv.de/user/themes/iserv/dist/images/iserv-logo_170x60px.png)
 
 # **Marp**
 
@@ -30,4 +30,4 @@ foobar
 # Slide 2
 
 foobar
-```
\ No newline at end of file
+```
