css - Cutting a triangle out of div, BUT have it horizontally centered -


sorry if has been answered can't find anywhere!!

i need transparent triangle cut out of white div (to form down arrow), css shapes it, thing i'm stumped on how create 2 100% width white blocks on either side...

like this:

enter image description here

any great.

many thanks

now you've provided image, i'll change answer want.

the trick i'd use create :before , :after elements absolutely positioned, 1 left , 1 right. each 1 has borders create shapes. key box-sizing trick means borders inside width, rather added onto, allowing define 50% width :before , :after pseudo elements.

note image i'm using background in demo rectangular, doesn't have triangle in image!

hmtl

<div class="box">   i'm box. </div>

css

/* apply natural box layout model elements */ *, *:before, *:after {   -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; }  .box {   background: transparent url('http://i.imgur.com/ipgvbz0.png') no-repeat;   padding: 20px;   min-height: 200px; /* show image */   margin: 10px;   position: relative; }  .box:before, .box:after {   content: '';   display: block;   position: absolute;   bottom: 0;   width: 50%;   border-bottom: 20px solid white;   }  .box:before {   left: 0;   border-right: 20px solid transparent; }  .box:after {   right: 0;   border-left: 20px solid transparent; }

demo


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