效果图：
注意以下要点：
1、提示框的箭头效果，且箭头随位置变动。
2、提示框的关闭按钮，且提示框内容高度随意。
3、阴影效果
代码：
<!DOCTYPE HTML>
<HTML>
<HEAD>
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script>
$(function(){
function showTip(flag){
var tip = $("p.tool-tip-content-wrapper, p.tool-tip-info-border");
if(flag) tip.show();
else tip.hide();
}
$("span.tool-tip-info").on("click",function(){
showTip(true);
});
$("p.tip-content-btn").on("click",function(){
showTip(false);
});
});
</script>
<style>
.tool-tip-info-border{
display:none;
}
.tool-tip-info-border-b{
border-top-color: #fff;
border-left-color: transparent;
border-right-color: transparent;
border-bottom-color: transparent;
border-style: dashed dashed solid;
border-width: 8px;
position: absolute;
top: -12px;
left: -2px;
z-index:2000;
height: 0;
width: 0;
}
.tool-tip-info-border-a{
border-top-color: #aaa;
border-left-color: transparent;
border-right-color: transparent;
border-bottom-color:transparent;
border-style: dashed dashed solid;
border-width: 8px;
position: absolute;
top: -11px;
left: -2px;
z-index:2000;
height: 0;
width: 0;
}
.tool-tip-content {
background: #fff;
border: 1px solid #ccc;
border-color: rgba(0,0,0,.2);
-webkit-box-shadow: 0 2px 10px rgba(0,0,0,.2);
box-shadow: 0 2px 10px rgba(0,0,0,.2);
outline: none;
overflow: hidden;
position: absolute;
left: 0px;
bottom: 7px;
-webkit-animation: gb__a .2s;
animation: gb__a .2s;
-webkit-border-radius: 2px;
border-radius: 2px;
-webkit-user-select: text;
width:360px;
height:auto;
padding:15px;
font: 13px 'Lato',sans-serif;
color:rgb(51,51,51);
box-sizing: border-box;
}
.tool-tip-info{
position:relative;
display:inline-block;
width:13px;
height:13px;
text-align:center;
line-height:13px;
border: 1px solid #407bae;
border-radius:10px;
color:#407bae;
font: 12px 'Lato',sans-serif;
cursor:pointer;
}
.tip-content-btn{
position:absolute;
top:2px;
right:2px;
width:13px;
height:13px;
cursor:pointer;
}
.tip-content-btn:before{
position:absolute;
top:1px;
left:3px;
width:1px;
height:15px;
background-color:#888;
transform: rotate(-45deg);
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
content:"";
}
.tip-content-btn:hover:before{
background-color:#333;
}
.tip-content-btn:after{
position:absolute;
top:1px;
left:3px;
width:1px;
height:15px;
background-color:#888;
transform: rotate(45deg);
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
content:"";
}
.tip-content-btn:hover:after{
background-color:#333;
}
.tool-tip-content-wrapper{
position:relative !important;
height:0px;
display:none;
z-index:1000;
}
</style>
</HEAD>
<BODY>
<p>Paragraph A</p>
<p>Paragraph B</p>
<p>Paragraph C</p>
<p>Paragraph D</p>
<p>Paragraph E</p>
<p>Paragraph F</p>
<p>Paragraph G</p>
<p class="tool-tip-content-wrapper">
<p class="tool-tip-content">
<p class="tip-content-msg">
Providing your last name adds another
layer of security and keeps your World Of Tester profile protected.
</p>
<p class="tip-content-btn"></p>
</p>
</p>
<p>
Last Name:
<span class="tool-tip-info">
<span>i</span>
<p class="tool-tip-info-border">
<p class="tool-tip-info-border-a"></p>
<p class="tool-tip-info-border-b"></p>
</p>
</span>
</p>
<hr/>
<!--======== TEST CODE ONLY :::::::: Test Begin =========== -->
<p>Paragraph A</p>
<p>Paragraph B</p>
<p>Paragraph C</p>
<p>Paragraph D</p>
<p>Paragraph E</p>
<p>Paragraph F</p>
<p>Paragraph G</p>
<p class="tool-tip-content-wrapper">
<p class="tool-tip-content">
<p class="tip-content-msg">
Providing your last name adds another
layer of security and keeps your World Of Tester profile protected.
Providing your last name adds another
layer of security and keeps your World Of Tester profile protected.
Providing your last name adds another
layer of security and keeps your World Of Tester profile protected.
Providing your last name adds another
layer of security and keeps your World Of Tester profile protected.
</p>
<p class="tip-content-btn"></p>
</p>
</p>
<p>
Longer - Last Name:
<span class="tool-tip-info">
<span>i</span>
<p class="tool-tip-info-border">
<p class="tool-tip-info-border-a"></p>
<p class="tool-tip-info-border-b"></p>
</p>
</span>
</p>
<!--======== TEST CODE ONLY :::::::: Test End =========== -->
<BODY>
</HTML>
以上就是CSS如何实现提示框的实例详解的详细内容，更多请关注其它相关文章！
