Update style.scss

Author: hh4ts

assets/css/style.scss

@@ -4,6 +4,6 @@
 @import "jekyll-theme-slate";
 
 #header_wrap {
-    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url("../../figs/background.jpg") no-repeat center center;
+    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url("../../figs/background.jpeg") no-repeat center center;
     background-size: cover;
-  }
+  }