How to make a box with arrow in CSS?

How to make a box with arrow in CSS?

Making round corner is easy. but any idea to make the arrow on left side without using image.开发者_运维问答

Is it possible to make possible with

only one elements <p>....</p>

body {
  background: #ff004e;
  padding: 40px
}
p {
  background: white;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;
  width: 250px;
  height: 150px
}

<p></p>

Like this :

.arrow {
    border: solid 10px transparent;
    border-right-color: #FFF;
}

Demo : http://jsfiddle.net/sparkup/edjdxjf2/

UPDATE :

It can also be achieved without empty elements with the css property :before

element:before {
    content: "";
    position: absolute;
    top: 50%;                         // half way down (vertical center).
    margin-top: -15px;                // adjust position, arrow has a height of 30px. 
    left:-30px;
    border: solid 15px transparent;
    border-right-color: #FFF;
    z-index: 1;
}

Demo : http://jsfiddle.net/sparkup/y89f1te0/

hope it helps

Chris Coyier has an excellent roundup of the possible shapes built in CSS using a single element (and before/afters): http://css-tricks.com/examples/ShapesOfCSS/

Standard Tool-tip

If you want a simple arrow, then you can add a pseudo element with border-right.

body {
    background:#ff004e;
    padding:40px;
}
p {
    background:white;
    border-radius: 10px;
    width:250px;
    height:150px;
    position: relative;
    display: inline-block;
}
p:before {
    content:"";
    position: absolute;
    height: 0px;
    width: 0px;
    top: 60px;
    left: -29px; /* 1px buffer for zooming problems while rendering*/
    border-width: 15px;
    border-color: transparent white transparent transparent;
    border-style: solid;
}

<p></p>

FIDDLE 1

Flat edge Tool-tip

If you want a flat edge for arrow, try this :

body {
    background: #ff004e;
    padding:40px;
}
p {
    background:white;
    border-radius: 10px;
    width:250px;
    height:150px;
    position: relative;
    display: inline-block;
}
p:before {
    content:"";
    position: absolute;
    height: 45px;
    width: 16px; /* 1px buffer for zooming problems while rendering*/
    top: 50px;
    left: -15px; 
    background: white;
}
p:after {
    content:"";
    position: absolute;
    height: 40px;
    width: 15px;
    border-radius: 0 40px 40px 0;
    top: 75px;
    left: -15px;
    background: #ff004e;
    box-shadow: 0 -45px 0 0 #ff004e;
}

<p></p>

FIDDLE 2

Use this online tool and you can do it without typing lot of code

http://www.cssarrowplease.com

My answer (with no flat edge), added some calculation formula:

.mainBox {
    border: solid 1px #e0e0e0;        
}

.mainBox:before {
    content:"";
    position: absolute;
    /*The right value must be calculated with: (top value of after) - (top value of before) = (right value of before) */
    /*example: (-4px) - (-7px) = 3px*/
    right: 72px; 
    /*The `top` value must be identical to border-width*/
    top: -7px; 
    width: 0;
    height: 0;
    border-style: solid;
    /*The `border-width` value must be identical to top*/
    border-width: 0 7px 7px 7px;
    /*The border color 3rd (#e0e0e0) value must be identical to its parent border color*/
    border-color: transparent transparent #e0e0e0 transparent;
    /*The (z-index of before) must at least one below the (z-index of after)*/
    /*Example: (z-index of before) < (z-index of after) or 9998 < 9999*/
    z-index:9998;
}

.mainBox:after {
    content:"";
    position: absolute;
    right: 75px;
    top: -4px; /*suppose to be identical to border-width*/
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 4px 4px 4px;
    border-color: transparent transparent #fff transparent; 
    z-index:9999;
}

The basic rules are:

1. The before right value must be calculated with: (after's top) - (before's top) = (before's right)

example: (-4px) - (-7px) = 3px

2. The before and after's top value must be identical to border-width.

3. The border color 3rd (#e0e0e0 in the example) value must be identical to its parent border color.

4. The before's z-index must at least one below the after's z-index.

example: (before's z-index) < (after's z-index) or 9998 < 9999.

The result:

a.right{ border-style: dashed;
  border-color: transparent;
  border-width: 0.53em;
  display: -moz-inline-box;
  display: inline-block;
  font-size: 100px;
  height: 0;
  line-height: 0;
  position: relative;
  vertical-align: middle;
  width: 0; border-left-width: 1em;
  border-left-style: solid;
  border-left-color: #666;
  left: 0.25em; }

the above code can be used for right arrow.

You can make use of span if u don't want to use a div.

span#pointer{border:solid 10px transparent;border-right-color:#fff;position:absolute;margin:-85px 0 0 -20px;}

http://jsfiddle.net/SSKwn/