css - How to Stick the arrow icon to line -


am trying make border css below has small triangle icon css needs centered border line of div. if use float:right or left arrow icon goes either end of border line, can make center , if possible stick border line responsive design.

.center {    text-align: center;    border: 3px solid green;  }  .arrow-down {     width: 0;    height: 0;    border-left: 10px solid rgba(30, 7, 7, 0);    border-right: 10px solid transparent;    border-top: 10px solid #f00;  }
<!doctype html>  <html>  <head>  </head>  <body>    <div class="center">      <p>this text centered.</p>    </div>    <div class="arrow-down"></div>      <div class="center">      <p>this second text centered.</p>    </div>    <div class="arrow-down"></div>      <div class="center">      <p>this third text centered.</p>    </div>    <div class="arrow-down"></div>  </body>  </html>

you can set margin-left: 50% bring center, , set margin-top: -3px move on border of previous element.

.center {    text-align: center;    border: 3px solid green;      }    .arrow-down {    width: 0;    height: 0;    border-left: 10px solid rgba(30, 7, 7, 0);    border-right: 10px solid transparent;    border-top: 10px solid #f00;    margin-top: -3px;    margin-left: 50%;  }
<div class="center">    <p>this text centered.</p>  </div>  <div class="arrow-down"></div>    <div class="center">    <p>this second text centered.</p>  </div>  <div class="arrow-down"></div>    <div class="center">    <p>this third text centered.</p>  </div>  <div class="arrow-down"></div>


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