javascript - How to invert the anchoring inside a `<div>` to the bottom instead of the top? -


i'm building chat application , need messages anchor bottom of message index , grow rather hanging top of message index. i'm building in react, following code jsx.

message index:

        <div classname="chat-message-index">          {this.state.activechannel.messages.map(function(message{            return <message key={message.sid} message={message} />;             })}         </div>

messages (rendered within index):

<div classname="chat-message">   <b classname="name">{this.state.author}</b><br/>   <span dangerouslysetinnerhtml={{__html: this.state.message.body}} /> </div>

css:

.chat-message-index {   height: calc(~"100vh - 250px");   position: absolute;   overflow-y: scroll;   width: 100%;   background-color: silver;   display: list-item; }  .chat-message {   position:relative;   padding:10px;   margin:22px 45px 22px 20px;   color:#fff;   background:#43464b;   background:-webkit-gradient(linear, 0 0, 0 100%, from(#aeb5ba), to(#43464b));   background:-moz-linear-gradient(#aeb5ba, #43464b);   background:-o-linear-gradient(#aeb5ba, #43464b);   background:linear-gradient(#aeb5ba, #43464b);   -webkit-border-radius:10px;   -moz-border-radius:10px;   border-radius:10px; }

i have tried every css trick can think of, every idea i've found through googling , here on so, , can't find anything. closest i've gotten using transform:rotate(180deg); on both message index , messages, inverts scrolling , causes scroll bar appear on left side of index, doesn't work. can make approach work, feels hacky , gut feeling cause headaches down road...

does know how invert anchoring <div>? want first message display @ bottom of message index <div> , each additional message stack on top of <div>'s came before.

flexbox can that:

.chatbox {    margin: 1em auto;    width: 150px;    height: 500px;    border: 1px solid grey;    display: flex;    flex-direction: column-reverse;    justify-content: flex-start;    text-align: center;  }  .message {    background: lightgreen;    margin-bottom: .25em;    padding: .25em 0 0 0;    border-bottom: 2px solid green;  }
<div class="chatbox">    <div class="message">message 1</div>    <div class="message">message 2</div>    <div class="message">message 3</div>    <div class="message">message 4</div>    <div class="message">message 5</div>    <div class="message">message 6</div>    <div class="message">message 7</div>    <div class="message">message 8</div>    <div class="message">message 9</div>    <div class="message">message 10</div>    <div class="message">message 11</div>    <div class="message">message 12</div>  </div>


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