input element overflowing outside of div - html

Question

I want to position an input element inside a div , but for some reason the input element is overflowing the div. What is the issue?
http://jsfiddle.net/aklintsevich/p1o584wg/
html:
<section class="full" id="third">
<div id="contact">
<form action="#" method="post" id="form">
<div class="email_info top white_border icomoon">
<div id="name_font" class="icon center_text">
</div>
<div>
<input type="text" name="firstname">
</div>
</div>
<div class="email_info bottom white_border icomoon">
<div id="email_font" class="icon center_text">
</div>
<div >
<input type="text" name="firstname">
</div>
</div>
</form>
</div>
</section>
css:
#third{
background-color:#22AFA0;
}
#contact{
background-color:blue;
margin:0px auto 30px auto;
position:relative;
top:30%;
width:65%;
height:30%;
background-color:red;
}
.email_info{
height:40%;
width:45%;
position:absolute;
background-color:green;
}
.message{
position:absolute;
right:0px;
height:100%;
width:45%;
background-color:green;
}
#message_icon{
height:40%;
width:20%;
background-color:blue;
border-right:1px solid white;
border-bottom:1px solid white;
}
#message_icon:before{
color:white;
display:block;
width:100%;
height:100%;
text-align:center;
line-height:80px;
font-size:2.5em;
content:"\e610";
}
.text_position{
float:right;
position:absolute;
}
.top{
top:0px;
}
.bottom{
bottom:0px;
}
#form_button{
position:relative;
width:65%;
height:20%;
/*background-color:orange;*/
}
.icon{
width:20%;
height:100%;
background-color:blue;
border-right:1px solid white;
}
.icomoon{
font-family: 'icomoon';
speak: none;
font-style: normal;
font-weight: normal;
-webkit-font-smoothing: antialiased;
}
.white_border{
border:2px solid white;
}
.center_text{
text-align:center;
}
#name_font:before{
font-size:2.5em;
display:block;
width:100%;
height:100%;
line-height:80px;
color:white;
content:"\e611";
}
#email_font:before{
font-size:2.5em;
display:block;
width:100%;
height:100%;
line-height:80px;
color:white;
content:"\e60f";
}

Answer 1

set the attribute 'overflow' to 'auto' in relevant div s. as an example,
.email_info{
overflow : auto;
}

Answer 2

Divs have a default display of block,therefore, to have two divs to be able to line up on the same line you have to declare them as inline-block.
.email_info{
display:inline-block;
}