模态框

<style>
      * {
        padding: 0;
        margin: 0;
        user-select: none;
        box-sizing: border-box;
      }
      body {
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
      }
      button {
        outline: 0;
        width: 150px;
        height: 60px;
        color: rgb(89, 89, 233);
        border-radius: 6px;
        border: 2px solid rgb(43, 238, 205);
        background-color:rgb(209, 183, 183);
        transition: all 0.3s;
        cursor: pointer;
      }
      button:hover {
        color:rgb(247, 233, 233);
        border-color: rgb(126, 126, 192);
        background-color: rgb(45, 45, 226);
      }
      .model-box {
        display: none;
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: rgba(0, 0, 0, 0.45);
      }
      .content {
        display: none;
        position: absolute;
        top: 100px;
        left: calc(50% - 210px);
        width: 420px;
        height: 350px;
        border-radius: 10px;
        padding: 0 20px;
        box-shadow: 0 2px 12px rgba(116, 65, 65, 0.2);
        background-color: rgb(102, 93, 93);
      }
      .content .title {
        display: flex;
        justify-content: space-between;
        height: 60px;
        line-height: 60px;
      }
      .content .title span {
        font-size: 18px;
        color: rgb(224, 166, 166);
      }
      .content .title i {
        font-style: normal;
        font-size: 24px;
        color: rgb(241, 220, 220, 0.322);
        cursor: pointer;
      }
      .content .title i:hover {
        color: rgb(37, 37, 206);
      }
      .content form .form-input {
        margin: 22px 0;
      }
      .content form .form-input label {
        font-size: 15px;
        color: rgb(236, 241, 236);
        cursor: pointer;
      }
      .content form .form-input input {
        outline: 0;
        width: 100%;
        height: 24px;
        padding: 0 15px;
        margin-top: 20px;
        border: 1px solid rgb(78, 72, 72)
        border-radius: 4px;
      }
      .content form .form-input button {
        float: right;
      }
    </style>
  </head>
  <body>
    <button
      onclick="document.querySelector('.model-box').style.display='block';document.querySelector('.content').style.display='block'"
    >
      登录
    </button>
    <div
      class="model-box"
      onclick="document.querySelector('.model-box').style.display='none';document.querySelector('.content').style.display='none'"
    ></div>
    <div class="content">
      <div class="title">
        <span>登录窗口</span>
        <i
          onclick="document.querySelector('.model-box').style.display='none';document.querySelector('.content').style.display='none'"
          >x</i
        >
      </div>
      <form action="">
        <div class="form-input">
          <label for="username">用户名</label>
          <input type="text" id="username" />
        </div>
        <div class="form-input">
          <label for="password">密码</label>
          <input type="text" id="password" />
        </div>
        <div class="form-input">
          <button>登录</button>
        </div>
        <div class="form-input">
          <button>找回密码</button>
        </div>
      </form>
    </div>
  </body>
效果图
模态框 flex grid

模态框

flex grid
