小编Abh*_*dey的帖子

<div style="border-style: solid; border-width: 2px; height: 5cm; width: 8cm;top: 20px; left: 20px; position: relative;  overflow: visible;" id="divimg">
  <img src="https://stepupandlive.files.wordpress.com/2014/09/3d-animated-frog-image.jpg" id="displayimg" style="height: 7cm; width: 10cm;" />
</div>

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  z-index: 1;
  height: auto;
  max-height: 200px;
  overflow-x: hidden;
}

.dropdown:hover .dropdown-content {
  display: block;
}

<h2>Hoverable Dropdown</h2>
<p>Move the mouse over the text below to open the dropdown content.</p>

<div class="dropdown">
  <span>Mouse over me</span>
  <div class="dropdown-content">
    <p>Hello World!</p>
    <p>Hello World!</p>
    <p>Hello World!</p>
    <p>Hello World!</p>
    <p>Hello World!</p>
    <p>Hello World!</p>
    <p>Hello World!</p>
    <p>Hello World!</p>
    <p>Hello …

function position() {
  var positionTop = Math.random() * 100;
  var positionLeft = Math.random() * 100;
  var position = "position:relative;top:" + positionTop + "%;left:" + positionLeft + "%;"
  return position;
}

document.getElementById("shape").onclick = function() {
  document.getElementById("shape").style.cssText = position();
}

#gameSpace {
  width: 100%;
  height: 470px;
  background: blue;
  margin: 0;
  padding-top: 30px;
}

#playSpace {
  width: 90%;
  height: 90%;
  margin: 0 auto;
  margin-top: 10px;
  border: 1px black solid;
}

#shape {
  width: 100px;
  height: 100px;
  background-color: red;
}

<div …

.box:hover {
  transform: scale(1.03);
  -ms-transform: scale(1.03);
  -webkit-transform: scale(1.03);
  -webkit-transition: all .01s ease-in-out;
  transition: all .01s ease-in-out;
}

div {
  padding-left: 30px;
  margin: 10px;
}

.box {
  border: 1px solid black;
}

<div class="box">
  <div>
    <input type="checkbox" name="opt1" id="option1" /> hello
  </div>
  <div>
    <select>
      <option>apple</option>
      <option>orange</option>
    </select>
  </div>
  <div>
    <input type="text" placeholder="enter something" />
  </div>
</div>

.navbar-collapse {
  height: 100vh;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />

<div class="navbar navbar-inverse navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="/"><img src="~/Images/logo.png" class="img-responsive" /></a>
    </div>
    <div class="navbar-collapse collapse">
      <ul class="nav navbar-nav">
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Option</a>
          <div class="dropdown-menu dropdown-communities" role="menu">
            <div class="row current-communities">
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                </ul>
              </div>
              <div class="col-md-4">
                <h4>Option</h4>
                <ul>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                  <li><a href="/Link/">Link</a></li>
                </ul> …

table {
  width: 100%;
}

<table>
  <tbody>
    <tr>
      <td>
        LoremipsumdolorsitametconsecteturadipisicingelitLaboredistinctionamdoloresmodiamet/etblanditiisarchitectsundolorem/qnullobcaecatnobilibermollitia/sialiquiodiomagncommodi.

      </td>
    </tr>
  </tbody>
</table>

table {
  width: 100%;
}

<table>
  <tbody>
    <tr>
      <td>
        LoremipsumdolorsitametconsecteturadipisicingelitLaboredistinctionamdoloresmodiametetblanditiisarchitectsundoloremqnullobcaecatnobilibermollitiasialiquiodiomagncommodi.
      </td>
    </tr>
  </tbody>
</table>

.foo {
  position: relative;
}

.tooltip {
  display: none;
}

.foo a:focus+.tooltip {
  display: block;
  background: black;
  position: absolute;
  color: white;
  padding: 5px;
  z-index: 1;
}

<div class="foo"><a href="#" class="foo"> this is a link</a>
  <div class="tooltip">this is a tooltip</div>
</div>
<div class="foo"><a href="#" class="link">this is a link</a>
  <div class="tooltip">this is a tooltip</div>
</div>