i can't seem to get my hover effects to work on button. have tried many tips-CodePudding

i am new and this is my first real assignment. i was able to get it right in other challenges but this one is a bit more complex and for some reason i just don't see where i'm going wrong. i have googled many options and none have really helped. i may have been staring at this for to long. but any help is appreciated.

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>3 day Forecast</title>
    <style>
      h1 {
        color: #1a64d6;
        font-size: 34px;
        font-family: Arial, Helvetica, sans-serif;
        margin: auto;
        text-align: center;
        line-height: 50px;
      }
      h2 {
        font-size: 34px;
        font-weight: normal;
        font-family: Arial, Helvetica, sans-serif;
        text-align: center;
        margin: auto;
        line-height: 48px;
      }
      h3 {
        text-align: center;
        list-style: none;
      }
      ul {
        text-align: center;
        list-style: none;
        padding: 20px;
        display: block;
      }
      p {
        opacity: 0.7;
        font-size: 18px;
      }
      li {
        font-family: Arial, Helvetica, sans-serif;
        text-align: center;
        margin: 0 auto;
        padding: 10px 0;
      }
      button {
        display: block;
        text-align: center;
        border: 1px solid #1a64d6;
        background-color: #1a64d6;
        display: block;
        margin: 20px auto;
        color: white;
        font-size: 16px;
        padding: 16px 24px;
        border-radius: 30px;
        box-shadow: 5px 5px 5px rgba(0,0,0,0.3);
        transition: all 200ms ease-in-out;
      }
      footer {
        text-align: center;
        opacity: 0.7;
        font-family: Arial, Helvetica, sans-serif;
      }
      button:hover {
        color: white;
        background: #1a64d6;
        cursor: pointer;
      }
    </style>
  </head>
  <body>
    <h1>
      ⛅
      <br />
      Currently 21° in Tokyo
    </h1>

    <h2>
      13° /
      <strong> 23° </strong>
    </h2>
    <ul>
      <li>
        <h3>