CSS: Make border on pure-CSS arrow

问题

I have this code snippet:

.multiply-button {
  display: table;
  background: rgba(0, 0, 0, 0);
  border: none;
  color: white;
  padding: 0;
}
.multiply-button-content {
  display: table-cell;
  background: green;
  padding: 10px 9px;
  border: solid 1px black;
  border-right: none !important;
}
.multiply-button-arrow {
  display: table-cell;
  width: 0px;
  height: 0px;
  border-style: solid;
  border-width: 20px 0 20px 12px;
  border-color: transparent transparent transparent green;
}

<button id="multiply-button" class="multiply-button">
  <div class="multiply-button-content">Multiply</div>
  <div class="multiply-button-arrow"></div>
</button>

I need to make border on this "arrowed" button. I can easily border rectangle part (I've already did it), but how to make this border on triangle part?

回答1:

The following should do what you need

.multiply-button {
  display: table;
  background: rgba(0, 0, 0, 0);
  border: none;
  color: white;
  padding: 0;
}
.multiply-button-content {
  display: table-cell;
  background: green;
  padding: 0 9px;
  border: solid 1px black;
  border-right: none !important;
  position: relative;
  vertical-align:middle;
  height: 40px; /* double the border width */
  box-sizing: border-box;
}
.multiply-button-content:after,
.multiply-button-content:before {
  left: 100%;
  top: 50%;
  border: solid transparent;
  content: " ";
  height: 0;
  width: 0;
  position: absolute;
  pointer-events: none;
  border-width: 20px 0 20px 12px;
  margin-top: -20px;
}
.multiply-button-content:after {
  border-color: rgba(0, 128, 0, 0);
  border-left-color: #008000;
  margin-left: -1px;
}
.multiply-button-content:before {
  border-color: rgba(0, 0, 0, 0);
  border-left-color: #000000;
}

<button id="multiply-button" class="multiply-button">
  <div class="multiply-button-content">Multiply</div>
</button>

This is a useful tool

回答2:

div{
  position: relative;
  background-color: #008000;
  padding: 0px 16px;
  height: 40px;
  line-height: 40px;
  display: inline-block;
  color: white;
  border: 2px solid black;
  border-right: none;
  z-index:1;
}

div:before{
  content: '';
  position: absolute;
  left: 100%;
  z-index:-1;
  width: 28px;
  height: 28px;
  background-color: #008000;
  border-right: 2px solid black;
  border-bottom: 2px solid black;
  transform: rotate(-45deg) translate(-14px,-7px);
}

<div>Multiply</div>

回答3:

Or much simplier :

the CSS with only one pseudo element

    .multiply-button {
       background: rgba(0, 0, 0, 0);
       border: none;
       width: 100px;
       color: #FFF;
       padding: 0;
       overflow: hidden;
    }

    .multiply-button-content {
       display: block;
       position: relative;
       background: #008000;
       width: 60px;
       padding: 10px 9px;
       border: solid 1px #000;
       border-right: none !important;
    }

    .multiply-button-content:before {
      content: "";
      position: absolute;
      width: 36px;
      height: 31px;
      z-index: -1;
      top: 0;
      right: -13px;
      border: 1px solid #000;
      background: #008000;
      transform: rotate(45deg);
    }

    <button id="multiply-button" class="multiply-button">
        <div class="multiply-button-content">Multiply</div>
    </button>

回答4:

Since it only takes one pseudo element to make the 'point', you could use the other to make a border behind it (making it slightly bigger in size).

For example;

div {
  height: 30px;
  border: 2px solid black;
  display: inline-block;
  border-right: 2px solid transparent;
  line-height: 30px;
  text-align: center;
  position: relative;
  background: tomato;
  color: white;
}
div:before {
  content: "";
  position: absolute;
  border: 17px solid transparent;
  border-left: 17px solid black;
  right: -35px;
  top: -2px;
  z-index: 6;
}
div:after {
  content: "";
  position: absolute;
  border: 15px solid transparent;
  border-left: 15px solid tomato;
  right: -31px;
  top: 0;
  z-index: 8;
}

<div>Arrow, Please!</div>

回答5:

You can achieve that with :before or :after pseudo selectors. Study and adjust the example below.

.multiply-button {
  display: inline;
  background: rgba(0, 0, 0, 0);
  border: none;
  color: white;
  padding: 0;
  position: realtive;
}
.multiply-button-content {
  display: table-cell;
  background: green;
  padding: 10px 9px;
  border: solid 1px black;
  border-right: none !important;
  width: 100px;
  position: relative;
}
.multiply-button-arrow {
  width: 0;
  height: 0px;
  border-style: solid;
  border-width: 20px 0 20px 12px;
  border-color: transparent transparent transparent black;
  position: absolute;
  top: -2px;
  right:-12px;
}

.multiply-button-arrow:before {
  border-style: solid;
  border-width: 20px 0 20px 12px;
  border-color: transparent transparent transparent green;
  position: absolute;
  right: 1px;
  top: -20px;
  content: "";
}

<button id="multiply-button" class="multiply-button">
  <div class="multiply-button-content">
    
    <div class="multiply-button-arrow"></div>
    Multiply</div>
  
</button>

来源：https://stackoverflow.com/questions/29140113/css-make-border-on-pure-css-arrow