provide all image tags with correct width and height values

app/views/layouts/application.html.erb

@@ -7,7 +7,7 @@
 		<header id="header">
 			<div class="header-content">
 				<div id="logo">
-					<%= image_tag "me-white.svg", height: "70" %>
+					<%= image_tag "me-white.png", width: "62", height: "70" %>
 					<a href=""> Georg Hopp aka Steffers </a>
 				</div>
 				<nav id="nav">
@@ -51,10 +51,12 @@
 				<a href="http://creativecommons.org/licenses/by/4.0/" rel="license">
 					<img alt="Creative Commons License"
 					     style="border-width:0"
+					     width="88"
+					     height="31"
 					     src="https://i.creativecommons.org/l/by/4.0/88x31.png" />
 				</a>
 				<a href="http://www.gnu.org/licenses/gpl-3.0.en.html" rel="license">
-					<%= image_tag("gpl-v3-red.svg", height: "30") %>
+					<%= image_tag("gpl-v3-red.png", height: "31", width: "62") %>
 				</a>
 			</div>
 		</footer>

app/views/welcome/index.html.erb

@@ -81,7 +81,8 @@
 	</div>
 </div>
 <div id="section2" class="section">
-	<%= image_tag "me.svg", class: "watermark", height: "600px" %>
+	<%= image_tag "me.png", class: "watermark",
+		width: "528px", height: "600px" %>
 	<div class="content">
 		<div id="skills">
 			<div class="title">