css - Why is there a vertical gap between these divs? -


for reason on chrome have "lime" colored 1px line between "top" , "bod". when remove overflow css directive line goes away.

i can see "lime" line in chrome , not in firefox.

enter image description here

here code: https://jsfiddle.net/m36yk1o9/5/

#chatapplicationclassic {    padding: 0;    margin: 0;    border: 0;    position: fixed;    bottom: 0px;    right: 30px;    width: 300px;    background-color: lime;    box-sizing: border-box;    border-radius: 5px 5px 0 0;    box-shadow: 0px 0px 5px #000000;  }    #chatheaderclassic {    padding: 0;    margin: 0;    border: 0;    width: 100%;    background-color: pink;    cursor: pointer;    border-radius: 5px 5px 0 0;    border-top: 0px solid red;    border-left: 0px solid red;    border-right: 0px solid red;    border-bottom: 0px solid red;    box-sizing: border-box;  }    #chatheadertextclassic {    padding: 0;    margin: 0;    border: 0;    color: #ffff33;    font-family: 'open sans', sans-serif;    padding: 6px;    font-size: 18px;    font-weight: 100;    display: inline-block;    border-radius: 5px 5px 0 0;  }    #chatheaderarrowclassic {    padding: 0;    margin: 0;    border: 0;    color: #9900ff;    display: inline-block;    float: right;    padding: 6px;    font-size: 18px;  }    #chatbodyclassic {    padding: 0;    margin: 0;    border: 0;    background-color: white;    border-left: 5px solid pink;    border-right: 5px solid pink;    height: 200px;    width: 100%;    box-sizing: border-box;    padding-top: 10px;    overflow: scroll;  }    .chatagentbubbleclassic {    padding: 0;    margin: 0;    border: 0;    background-color: #664eff;    margin-right: 40px;    margin-top: 10px;    box-sizing: border-box;    border-radius: 4px;  }    .chatvisitorbubbleclassic {    padding: 0;    margin: 0;    border: 0;    background-color: #6600ff;    margin-left: 40px;    margin-top: 10px;    box-sizing: border-box;    border-radius: 4px;  }    .chatagentbubbletextclassic {    font-size: 12px;    padding: 8px;    font-family: sans-serif;    color: lightblue;  }    .chatvisitorbubbletextclassic {    font-size: 12px;    padding: 6px;    font-family: sans-serif;    color: skyblue;  }
<div id="chatapplicationclassic">    <div id="chatheaderclassic">      <div id="chatheaderarrowclassic">        arr      </div>      <div id="chatheadertextclassic">        top      </div>    </div>    <div id="chatbodyclassic">      bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br />    </div>    <!--  	<div id="chatfooterclassic">  		<div id="chatinputcontainerclassic">  			<input placeholder="type here..." id="chatinputclassic" type="text" />   		</div>  		<div id="chatsendbutton">  			<div id="chatsendbuttontext">send</div>  		</div>  	</div>-->  </div>

it's 2 child elements in header. padding makes 1 of box taller container, float set there causes overflow, didn't set clearfix there.

but since have float:right set on "top", set float:left on "arr", , clear floats adding overflow:hidden on container. thin lime line removed.

updated jsfiddle

#chatapplicationclassic {    padding: 0;    margin: 0;    border: 0;    position: fixed;    bottom: 0px;    right: 30px;    width: 300px;    background-color: lime;    box-sizing: border-box;    border-radius: 5px 5px 0 0;    box-shadow: 0px 0px 5px #000000;  }    #chatheaderclassic {    padding: 0;    margin: 0;    border: 0;    width: 100%;    background-color: pink;    cursor: pointer;    border-radius: 5px 5px 0 0;    border-top: 0px solid red;    border-left: 0px solid red;    border-right: 0px solid red;    border-bottom: 0px solid red;    box-sizing: border-box;    overflow: hidden; /*added*/  }    #chatheadertextclassic {    padding: 0;    margin: 0;    border: 0;    color: #ffff33;    font-family: 'open sans', sans-serif;    padding: 6px;    font-size: 18px;    font-weight: 100;    /* display: inline-block; */    border-radius: 5px 5px 0 0;    float: left; /*added*/  }    #chatheaderarrowclassic {    padding: 0;    margin: 0;    border: 0;    color: #9900ff;    /* display: inline-block; */    float: right;    padding: 6px;    font-size: 18px;  }    #chatbodyclassic {    padding: 0;    margin: 0;    border: 0;    background-color: white;    border-left: 5px solid pink;    border-right: 5px solid pink;    height: 200px;    width: 100%;    box-sizing: border-box;    padding-top: 10px;    overflow: scroll;  }    .chatagentbubbleclassic {    padding: 0;    margin: 0;    border: 0;    background-color: #664eff;    margin-right: 40px;    margin-top: 10px;    box-sizing: border-box;    border-radius: 4px;  }    .chatvisitorbubbleclassic {    padding: 0;    margin: 0;    border: 0;    background-color: #6600ff;    margin-left: 40px;    margin-top: 10px;    box-sizing: border-box;    border-radius: 4px;  }    .chatagentbubbletextclassic {    font-size: 12px;    padding: 8px;    font-family: sans-serif;    color: lightblue;  }    .chatvisitorbubbletextclassic {    font-size: 12px;    padding: 6px;    font-family: sans-serif;    color: skyblue;  }
<div id="chatapplicationclassic">    <div id="chatheaderclassic">      <div id="chatheaderarrowclassic">        arr      </div>      <div id="chatheadertextclassic">        top      </div>    </div>    <div id="chatbodyclassic">      bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br /> bod      <br />    </div>    <!--  	<div id="chatfooterclassic">  		<div id="chatinputcontainerclassic">  			<input placeholder="type here..." id="chatinputclassic" type="text" />   		</div>  		<div id="chatsendbutton">  			<div id="chatsendbuttontext">send</div>  		</div>  	</div>-->  </div>


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