Code Playground

body {
  background: #2E2F40;
  font-family: "Montserrat", sans-serif;
}

nav {
  max-width: 1000px;
  height: 0px;
  border-bottom: 100px solid #860255;
  border-left: 40px solid transparent;
  position: relative;
  margin: 0 auto;
  box-shadow: 20px 17px 27px rgba(0, 0, 0, 0.15);
}
nav::before {
  content: "";
  margin-top: 10%;
  display: block;
}
nav .inner {
  width: 100%;
  height: 100px;
  position: absolute;
  right: 0;
  overflow: hidden;
  background: #860255;
  /* Webkit (Safari/Chrome 10) */
  background-image: -webkit-gradient(linear, left top, right top, color-stop(0, #860255), color-stop(100, #EF4B3F));
  /* IE10+ */
  background-image: -ms-linear-gradient(left, #860255 0%, #EF4B3F 100%);
  /* Mozilla Firefox */
  background-image: -moz-linear-gradient(left, #860255 0%, #EF4B3F 100%);
  /* Opera */
  background-image: -o-linear-gradient(left, #860255 0%, #EF4B3F 100%);
  /* Webkit (Chrome 11+) */
  background-image: -webkit-linear-gradient(left, #860255 0%, #EF4B3F 100%);
  /* W3C Markup */
  background-image: linear-gradient(to right, #860255 0%, #EF4B3F 100%);
}
nav .active {
  top: 80px !important;
  position: relative;
  transition: all 0.3s;
}
nav ul {
  float: right;
  list-style-type: none;
  line-height: 6.2;
  padding: 0;
  margin: 0;
  transition: all 0.3s;
  position: relative;
  top: 0;
}
nav li {
  display: inline-block;
  margin: 0;
}
nav li::before {
  content: " / ";
  margin: 0 10px;
  color: rgba(255, 255, 255, 0.5);
}
nav li:first-child::before {
  display: none;
}
nav .search {
  width: 80px;
  height: 0px;
  float: right;
  color: #fff;
  font-size: 18px;
  border-bottom: 100px solid rgba(0, 0, 0, 0.1);
  border-left: 40px solid transparent;
  position: relative;
  transition: 0.3s;
}
nav .search::before {
  content: "";
}
nav .search:hover {
  border-bottom: 100px solid rgba(0, 0, 0, 0.3);
}
nav .fa-search {
  position: relative;
  left: 25px;
  top: 38px;
}
nav input[type=search] {
  background: transparent;
  border: none;
  border-bottom: 2px solid #fff;
  -webkit-appearance: none;
}
nav input.search_box {
  position: absolute;
  font-size: 16px;
  color: #fff;
  line-height: 4;
  top: -100px;
  width: 320px;
  right: 130px;
  transition: all 0.3s;
}
nav .search_box_active {
  top: 15px !important;
  transition: all 0.3s;
}
nav input:focus {
  outline: none;
}
nav input::-webkit-input-placeholder {
  color: #fff;
}
nav input[type=search]::-webkit-search-cancel-button {
  -webkit-appearance: none;
  height: 1px;
  width: 15px;
  background: transparent;
  border-radius: 50%;
}
nav input[type=search]::-webkit-search-cancel-button::before {
  content: "+";
  color: #fff;
  font-weight: bold;
  -webkit-transform: rotate(45deg);
  font-size: 21px;
  position: absolute;
  top: -10px;
}
nav a {
  color: #fff;
  text-decoration: none;
}

Frontend Forever App