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--- a/docs/chapter_greedy/greedy_algorithm.md
+++ b/docs/chapter_greedy/greedy_algorithm.md
@@ -27,7 +27,7 @@
 
 ## 贪心算法的优点与局限性
 
-**贪心算法不仅操作直接、实现简单，而且通常效率也很高**。在以上代码中，记硬币最小面值为 $\min(coins)$ ，则贪心选择最多循环 $amt / \min(coins)$ 次，时间复杂度为 $O(amt / \min(coins))$ 。这比动态规划解法的时间复杂度 $O(n \times amt)$ 提升了一个数量级。
+**贪心算法不仅操作直接、实现简单，而且通常效率也很高**。在以上代码中，记硬币最小面值为 $\min(coins)$ ，则贪心选择最多循环 $amt / \min(coins)$ 次，时间复杂度为 $O(amt / \min(coins))$ 。这比动态规划解法的时间复杂度 $O(n \times amt)$ 降低了一个数量级。
 
 然而，**对于某些硬币面值组合，贪心算法并不能找到最优解**。下图给出了两个示例。
 
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diff --git a/overrides/stylesheets/extra.css b/overrides/stylesheets/extra.css
index 08e4af7b..9737651a 100644
--- a/overrides/stylesheets/extra.css
+++ b/overrides/stylesheets/extra.css
@@ -54,6 +54,7 @@
   border-radius: 0.63rem;
   display: block;
   margin: 0 auto;
+  box-shadow: var(--md-shadow-z2);
 }
 
 /* Cover image class */