feat: changed structure

webseite/frontend/dev/scss/03_base/_theme.scss

@@ -0,0 +1,44 @@
+// Allgemeine Formatierungen für die ganze Webanwendung
+
+*,
+html {
+  box-sizing: border-box;
+}
+
+html,
+body {
+  height: 100%;
+  padding: 0;
+  margin: 0;
+}
+
+body {
+  font-family: $font-copy;
+}
+
+// Sticky footer
+body {
+  display: flex;
+  flex-direction: column;
+}
+
+main,
+#main {
+  flex: 1 0 auto;
+}
+
+body > footer,
+.footer-main {
+  flex-shrink: 0;
+}
+// /Sticky footer
+
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  font-family: $font-headline;
+  font-weight: 700;
+}