定位形式和多个图像

我在垂直和水平的核心中遇到问题，我设法将表单水平居中，但不能设法垂直居中，而不会导致表单和图像重叠。还有问题在页面底部水平居中。

.banner {
  position: relative;
  width: 100%;
  top: 0;
  left: 0;
  padding: 0;
  margin: 0;
  background-color: #595959;
  color: #fff;
  text-align: center;
  font-family: 'Lato', sans-serif;
  font-size: 25px;
  padding-top: 50px;
}
#imagesMain {
  position: relative;
  max-width: 75rem;
  left: 0;
  right: 0;
  margin: auto;
  bottom: 0;
  padding: 0;
  margin: 20px auto;
  text-align: center;
}
#imagesMain a {
  width: 30%;
  float: left;
  position: relative;
  margin: 1.5%;
}
img {
  max-width: 100%;
  height: auto;
  margin-right: 25px;
  position: relative;
}
body,
html {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}
body {
  vertical-align: middle;
}
#form {
  display: table;
  margin: 0 auto;
}

<!DOCTYPE html>
<body>
  <div class="banner">
    <h1>A-Level Revision Website</h1>
  </div>
  <div id="form">
    <form id="loginForm">
      <input type="email" class="login-username" autofocus="true" required="true" placeholder="Email" /><br>
      <input type="password" class="login-password" required="true" placeholder="Password" /><br>
      <input type="submit" name="Login" value="Login" class="login-submit" /><br>
      <a href="#" class="login-forgot-pass">forgot password?</a>
    </form>
  </div>
  <div id="imagesMain">
    <a href="Maths.html">
			<img src="https://i.pinimg.com/originals/06/9a/c8/069ac81cbe0e3a6f8fb43a0df42125a0.jpg" alt="Maths"">
		</a>
    <a href="ComputerScience.html">
      <img src="https://i.pinimg.com/originals/06/9a/c8/069ac81cbe0e3a6f8fb43a0df42125a0.jpg" alt="ComputerScience">
    </a>
    <a href="Physics.html">  
			<img src="https://i.pinimg.com/originals/06/9a/c8/069ac81cbe0e3a6f8fb43a0df42125a0.jpg" alt="Physics"">
		</a>
  </div>
  </html>

您可以使用 flexbox 进行这样的事情：

* {margin: 0; padding: 0; box-sizing: border-box}
body, html {height: 100%}
#container {
  display: flex; /* displays flex-items (children) inline */
  flex-direction: column; /* stacks them vertically */
  height: 100%;
}
.banner,
#loginForm,
.images {
  flex: 1;
}
/* Another example:
.banner {flex: 1}
#loginForm {flex: 2} Means that it takes twice as much space as .banner and .images (100% / 4 (in flex values) = 25%, i.e. flex: 1 = 25%).
.images {flex: 1}
*/
.banner {
  display: flex;
  justify-content: center; /* centers them horizontally */
  align-items: center; /* centers them vertically */
  text-align: center;
  background: #595959;
  color: #fff;
  font-family: 'Lato', sans-serif;
  font-size: 25px;
}
#loginForm {
  display: flex; /* also given flex properties */
  flex-direction: column; /* stacks the login form elements vertically */
  justify-content: center; /* aligns the form horizontally */
  align-items: center; /* aligns the form vertically */
  margin: 10px 0;
}
#loginForm > input {
  margin-bottom: 5px;
  padding: 5px;
}
.images {
  display: flex; /* also given flex properties */
  justify-content: center; /* aligns images horizontally */
  align-items: flex-end; /* aligns images at the bottom */
  padding: 10px 5px; /* for better presentation */
  background: #595959; /* for better presentation */
}
.images > a {
  margin: 0 5px;
}
.images > a > img {
  display: block;
  max-width: 100%;
}

<div id="container">
  <div class="banner">
    <h1>A-Level Revision Website</h1>
  </div>
  <form id="loginForm">
    <input type="email" class="login-username" placeholder="E-mail" autofocus="true" required>
    <input type="password" class="login-password" placeholder="Password" required>
    <input type="submit" class="login-submit" name="Login" value="Login">
    <a href="#" class="login-forgot-pass">Forgot password?</a>
  </form>
  <div class="images">
    <a href="Maths.html"><img src="https://i.pinimg.com/originals/06/9a/c8/069ac81cbe0e3a6f8fb43a0df42125a0.jpg" alt="Maths"></a>
    <a href="ComputerScience.html"><img src="https://i.pinimg.com/originals/06/9a/c8/069ac81cbe0e3a6f8fb43a0df42125a0.jpg" alt="ComputerScience"></a>
    <a href="Physics.html"><img src="https://i.pinimg.com/originals/06/9a/c8/069ac81cbe0e3a6f8fb43a0df42125a0.jpg" alt="Physics"></a>
  </div>
</div>

该解决方案完全响应。我给了1的所有三个儿童 flex value 使它们在 height中相等（100％/3（在 flex values中）= 33.33％，即flex: 1 = 33.33％）。如果您愿意，可以给每个孩子的价值不同，例如#container > .banner {flex: 1;} #container > #loginForm {flex: 2;} #container > .images {flex: 3;}或任何其他号码（也可以使用小数），看看它们的响应方式。

您可以根据需要调整flex 值以获得所需的结果，但是请注意，.banner和.images的不同值导致#loginForm在上不为垂直中心屏幕。还要注意，如果 flex-item 内的内容（ img s）的原始 height在某个时候比 item 本身的height大，那么将影响 flex-items height。

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