Не меняется стиль импута. Именно вот где ваш запрос.

https://imgur.com/a/aupuWV4

* {
  margin:  0;
  padding: 0;
}

input[type="text"], input[type="password"], input[type="search"] {
	color: #5d5d5d;
	width: 60%;
	padding: 8px;
}

input, texttarea {
	outline: none;
    border: none;
    border: solid 1px #f2f2f2;
}

h1,h2 {
	font: normal 170% 'century gothic' , arial;
	margin: 0 0 15px 0;
	padding: 15px 0 5px 0;
	color: #000;
}

h2 {
	font-size: 140%;
}

.header {
	background-color: darkslateblue;
	height: 177px;
	font-size: 0.8em;
	margin-left: 0px;
	margin-right: 0px;
	min-width: 900px;
}

.main, .logo, .menubar, .site_content, .footer {
	margin-left: auto;
	margin-right: auto;
}

.logo {
	width: 880px;
	padding-bottom: 40px;
}

.logo h1, .logo h2 {
	font: normal 300% 'century gothic', arial, sans-serif;
	margin: 0 0 0 9px;
}

.logo_text h1, .logo_text h1 a, .logo_text h1 a:hover {
    color: #f11; 
	padding: 22px 0 0 0;
	color: #fff;
	letter-spacing: 0.1em;
	text-decoration: none;
}

.logo_text h2 {
	font-size: 0.9em;
	padding: 4px 0 0 0;
	color: #999;
}

  menubar {
  width: 900px;
  height: 46px;
}

ul.menu {
  float: right;
}

ul.menu li {
  float: left;
  padding: 0 0 0 9px;
  list-style: none;
  margin: 1px 2px 0 0;
}

ul.menu li a {
  font: normal 100% 'trebuchet ms', sans-serif;
  display: block;
  height: 20px;
  padding: 6px 35px 5px 28px;
  color: #fff;
  text-decoration: none;
}

ul.menu li.selected a {
  color: #aeb002;
}

ul.menu li a:hover {
  color: #e4ec04;
}

.site_content {
 width: 1860px;
 overflow:hidden;
 margin: 20px auto 0 auto;
 background-color: white;
}

.sidebar_container {
	float: right;
    width: 224px;
}
.sidebar {
	float: right;
	width: 222px;
	padding: 5%;
	margin: 0 0 16px 0;
	border: solid 1px #f2f2f2;
	border-radius: 5px;
	background-color: #f9f9f9;
}

.btn {
	padding:0px;
	background-color: white;
	cursor:pointer;
}

.sidebar h2{
	color: #136cb2;
}