update elements and fix some bugs

lib/src/prism/plugins/previewer-easing/prism-previewer-easing.css

Index: lib/src/prism/plugins/previewer-easing/prism-previewer-easing.css
diff --git a/lib/src/prism/plugins/previewer-easing/prism-previewer-easing.css b/lib/src/prism/plugins/previewer-easing/prism-previewer-easing.css
new file mode 100644
index 0000000000000000000000000000000000000000..7b9c7f8352021e9256c11384d7306105412c7fbf
--- /dev/null
+++ b/lib/src/prism/plugins/previewer-easing/prism-previewer-easing.css
@@ -0,0 +1,29 @@
+.prism-previewer-easing {
+	margin-top: -76px;
+	margin-left: -30px;
+	width: 60px;
+	height: 60px;
+	background: #333;
+}
+.prism-previewer-easing.flipped {
+	margin-bottom: -116px;
+}
+.prism-previewer-easing svg {
+	width: 60px;
+	height: 60px;
+}
+.prism-previewer-easing circle {
+	fill: hsl(200, 10%, 20%);
+	stroke: white;
+}
+.prism-previewer-easing path {
+	fill: none;
+	stroke: white;
+	stroke-linecap: round;
+	stroke-width: 4;
+}
+.prism-previewer-easing line {
+	stroke: white;
+	stroke-opacity: 0.5;
+	stroke-width: 2;
+}