Windows:

Mac:

Este es el codigo del nav
Código:
  
<nav id="main">
			<input type="text" class="search" name="search" placeholder="¿En qué piensas?" >
			<input type="text" name="count" size="3" id="nwords_search" value="150">
			<input type="button" class="status_button" value="Enviar" onclick="if (document.getElementById('status_nav2').value != '') sendSpacer()">
</nav>
Código:
  
 nav {
	min-width: 1536px;
	z-index: 1;
	position: fixed;
	top: 0px;
	margin: auto;
	height: 35px;
	width: 100%;
	text-align: left;
	background-color: #eeeff1;
}
#nwords_search{
	position: relative;
	height: 100%;
	width: 5.5%;
	border: 0;
	background-color: #dedfe3;
	text-align: center;
	color: #949ba8;
}
.status_button{
	position: relative;
	text-align: center;
	height: 100%;
	width: 5.6%;
	border: 0;
	background-color: #28a8e5;
	color: white;
	font-size: 12px;
	font-weight: lighter;
}
 
 
 

