如何在CSS中创建一个讲话泡泡？

Question

我想创建一个这样的演讲，

我尝试使用CSS创建。但我不能像这样对齐顶部箭头。我的代码是，

.bubble
{
  position: relative;
  width: 275px;
  height: 40px;
  padding: 5px;
  background: #C00006;
  -webkit-border-radius: 14px;
  -moz-border-radius: 14px;
  border-radius: 14px;
}

.bubble:after
{
  content: '';
  position: absolute;
  border-style: solid;
  border-width: 0 19px 79px;
  border-color: #C00006 transparent;
  display: block;
  width: 0;
  z-index: 1;
  margin-left: -19px;
  top: -79px;
  left: 69%;
}

<br><br><br><br>
<div class="bubble"></div>

Online example （在JSFiddle上）。

Answer 1

您可以使用skewX transform并指定origin of the transform，如下所示：

.bubble {
    position: relative;
        top: 4.8em;
    width: 275px;
    height: 40px;
    padding: 5px;
    background: #C00006;
    -webkit-border-radius: 14px;
    -moz-border-radius: 14px;
    border-radius: 14px;
}

.bubble:after {
    content: '';
    position: absolute;
    border-style: solid;
    border-width: 0 19px 79px;
    border-color: #C00006 transparent;
    display: block;
    width: 0;
    z-index: 1;
    /* top: -79px; */
    bottom: 100%; /* better than specifying the top */
    right: 38px;  /* equal to width of the arrow, for instance */
    
    -webkit-transform: skewX(-45deg);
    -moz-transform: skewX(-45deg);
    -ms-transform: skewX(-45deg);
    -o-transform: skewX(-45deg);
    transform: skewX(-45deg);
    
    -webkit-transform-origin: 38px 100%;
    -moz-transform-origin: 38px 100%;
    -ms-transform-origin: 38px 100%;
    -o-transform-origin: 38px 100%;
    transform-origin: 38px 100%;
}

<div class="bubble"></div>

值得注意的是，CSS会转换are supported in IE 9和更新。

Answer 2

您可以在:after psuedo选择器上使用CSS3 skew()方法，如下所示：

.bubble:after {
    -ms-transform: skew(-40deg, 0deg);
    -webkit-transform: skew(-40deg, 0deg);
    transform: skew(-40deg, 0deg);
}

这是 jsFiddle Demo 。

＆＃13;

＆＃13;

.bubble {
  position: relative;
  width: 275px;
  height: 40px;
  padding: 5px;
  background: #C00006;
  -webkit-border-radius: 14px;
  -moz-border-radius: 14px;
  border-radius: 14px;
}
.bubble:after {
  content: '';
  position: absolute;
  border-style: solid;
  border-width: 0 27px 79px;
  border-color: #C00006 transparent;
  display: block;
  width: 0;
  z-index: 1;
  margin-left: -19px;
  top: -79px;
  left: 69%;
  -ms-transform: skew(-40deg, 0deg);
  -webkit-transform: skew(-40deg, 0deg);
  transform: skew(-40deg, 0deg);
}

＆＃13;

<br/>
<br/>
<br/>
<br/>
<div class="bubble"></div>

＆＃13;

＆＃13;

＆＃13;

Answer 3

试试这个http://jsfiddle.net/harshdand/gczu8w4e/

.bubble:after
{
    content: '';
    position: absolute;
    border-style: solid;
    border-width: 0 19px 120px;
    border-color: #C00006 transparent;
    display: block;
    width: 0;
    z-index: 1;
    margin-left: -49px;
    top: -79px;
    left: 95%;
    -ms-transform: (50deg);
    -webkit-transform: rotate(50deg);
    transform: rotate(50deg);
}

transform：rotate（50deg）;

修改

usw skew而不是rotate。看到最小CSS的片段

<强> transform: skew(-45deg);

＆＃13;

＆＃13;

.bubble {
  position: relative;
  bottom: -70px;
  width: 275px;
  height: 40px;
  padding: 5px;
  background: #C00006;
  border-radius: 14px;
}
.bubble:after {
  content: '';
  position: absolute;
  border-style: solid;
  border-width: 0 19px 79px;
  border-color: #C00006 transparent;
  width: 1px;
  z-index: 1;
  bottom: 95%;
  left: 79%;
  transform: skew(-45deg);
}

＆＃13;

<div class="bubble"></div>

＆＃13;

＆＃13;

＆＃13;