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HTML 

              
                <header id="header" role="banner">
    <div id="mainNavigation" class="group">
      <div class="max-width">
        <section id="branding">
          <p class="screen-reader-text">Navigation Test</p>
          <a href="#skipMenu" class="screen-reader-text">Skip to Content</a>
          <div id="siteIdentity">
            <a href="#" rel="home">
              [Logo Here]
            </a>
          </div>
        </section>
        <nav id="menu" role="navigation">
          <div class="menu-main-menu-container">
            <ul id="menu-main-menu" class="menu">
              <li id="menu-item-28" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-home current-menu-item page_item page-item-7 current_page_item menu-item-28">
                <a href="#" aria-current="page">Home</a>
              </li>
              <li id="menu-item-27" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-27">
                <a href="#">About Us</a>
              </li>
              <li id="menu-item-26" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-26">
                <a href="#">Services</a>
                <ul class="sub-menu">
                  <li id="menu-item-25" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-25">
                    <a href="#">Service 1</a>
                  </li>
                  <li id="menu-item-24" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-24">
                    <a href="#">Service 2</a>
                  </li>
                </ul>
              </li>
              <li id="menu-item-23" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-396">
                <a href="#">Products</a>
                <ul class="sub-menu">
                  <li id="menu-item-25" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-397">
                    <a href="#">Product 1</a>
                  </li>
                  <li id="menu-item-24" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-398">
                    <a href="#">Product 2</a>
                  </li>
                  <li id="menu-item-24" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-399">
                    <a href="#">Product 3</a>
                  </li>
                  <li id="menu-item-24" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-400">
                    <a href="#">Product 4</a>
                  </li>
                  <li id="menu-item-24" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-401">
                    <a href="#">Product 5</a>
                  </li>
                </ul>
              </li>
              <li id="menu-item-22" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-22">
                <a href="#">Portfolio</a>
              </li>
              <li id="menu-item-395" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-395">
                <a href="#">Resources</a>
              </li>
              <li id="menu-item-23" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-23">
                <a href="#">Careers</a>
              </li>
              <li id="menu-item-32" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-32">
                <a href="#">Contact Us</a>
              </li>
            </ul>
          </div>
        </nav>
        <a id="skipMenu" class="screen-reader-text"></a>
      </div>
    </div>
  </header>
!

CSS 

              
                /* CSS reset - http://meyerweb.com/eric/tools/css/reset/ */
html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
  font: inherit;
  padding: 0;
  border: 0;
  margin: 0;
  vertical-align: baseline
}

* {
  -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
  -moz-box-sizing: border-box;    /* Firefox, other Gecko */
  box-sizing: border-box;         /* Opera/IE 8+ */
}

html {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 100%;
  line-height: 1.5;
  background-color: #333;
  color: #eee;
  min-height: 100vh;
}

body {
  -webkit-text-size-adjust: 100%;
}

a {
  color: #eee;
}

a:hover,
a:focus {
  color: #fff;
}

ol,
ul {
  list-style: none;
}

header,
nav,
section {
  display: block;
}

/* base classes */
.screen-reader-text {
  clip: rect(1px, 1px, 1px, 1px);
  position: absolute !important;
  margin: 0 0 0 0;
  padding: 0 0 0 0;
}

/* basic styles */
body,
p,
ul,
ol,
li,
button,
input[type="reset"],
input[type="button"],
input[type="submit"] {
  font-size: 1rem;
}

nav li,
nav li li,
nav li li li,
nav li li li li,
nav li li li li li,
nav li li li li li li {
  margin-left: 0;
}

/* basic styles */
/* https://css-tricks.com/snippets/css/clear-fix/ */
.group:after {
  content: "";
  display: table;
  clear: both;
}

.max-width {
  width: 1500px;
  max-width: 90%;
  margin: 0 auto;
}

/* navigation base styles and functionality */
nav ul, 
nav ul li {
  margin: 0 0 0 0;
}

nav ul,
nav ul > li,
nav ul > li ul > li,
nav ul > li ul > li ul > li,
nav ul > li ul > li ul > li ul > li {
  list-style-type: none;
}

#menu-main-menu {
  flex: 1 1 85%;
  display: flex;
  align-items: center;
}

#menu-main-menu > li {
  position: relative;
  text-align: center;
  -webkit-box-flex: 0 0 auto;
  -moz-box-flex: 0 0 auto;
  width: 0 0 auto;
  -webkit-flex: 0 0 auto;
  -ms-flex: 0 0 auto;
  flex: 0 0 auto;
  padding: 1.75rem 0;
}

#menu-main-menu > li:not(.hidden-links),
.menu-main-menu-container button {
  white-space: nowrap;
}

/* https://codepen.io/scottb/pen/gixIv */
ul#menu-main-menu li > ul {
  display: none;
  position: absolute;
  top: 100%;
  background: #fff;
  padding: 0;
}

ul#menu-main-menu li.menu-item-has-children:not(.visible) > ul {
  display: none;
}

body.has-hover ul#menu-main-menu li.menu-item-has-children:hover > ul,
ul#menu-main-menu li.menu-item-has-children.visible > ul {
  display: block;
}

body.has-hover ul#menu-main-menu li.menu-item-has-children:hover > ul ul.sub-menu,
ul#menu-main-menu li.menu-item-has-children.visible > ul ul.sub-menu {
  position: relative;
}

.sub-menu > li {
  display: block;
  position: relative;
}

ul#menu-main-menu li > ul > li a {
  text-decoration: none;
  padding: .5em 1em;
  display: block;
  max-width: 100%;
  white-space: normal;
}

ul#menu-main-menu li.menu-item-has-children > a {
  padding-right: 1.75rem;
}

ul#menu-main-menu li.menu-item-has-children::after {
  content: ' ';
  display: block;
  position: absolute;
  width: .5rem;
  height: .5rem;
  right: .5rem;
  top: calc(50% - .25rem);
  border-style: solid;
  border-color: #fff;
  border-width: 0 .15rem .15rem 0;
  -webkit-transform: rotate(45deg) translate(-25%,-25%);
  -ms-transform: rotate(45deg) translate(-25%,-25%);
  transform: rotate(45deg) translate(-25%,-25%);
}

ul#menu-main-menu li.menu-item-has-children.visible::after {
  top: calc(50% - .4rem);
  -webkit-transform: rotate(225deg) translate(-25%,-25%);
  -ms-transform: rotate(225deg) translate(-25%,-25%);
  transform: rotate(225deg) translate(-25%,-25%);
}

/* header and main menu bar styles */
header {
  border-bottom: .15rem solid #555;
}

#mainNavigation {
  position: relative;
  z-index: 99;
}

#branding {
  width: 15rem;
  float: left;
  padding: .75rem 0 .5rem;
  display: -webkit-box;
  display: -moz-box;
  display: -webkit-flexbox;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -ms-flex-pack: start;
  flex-pack: start;
  -webkit-justify-content: flex-start;
  -moz-justify-content: flex-start;
  -ms-justify-content: flex-start;
  justify-content: flex-start;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -moz-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

#siteIdentity {
  background-color: #555;
  padding: 1rem 1rem;
  width: 12.5rem;
  max-width: 100%;
  margin-right: 2.5rem;
  text-align: center;
}

#siteIdentity a {
  color: #fff;
  font-weight: bold;
  text-decoration: none;
}

#siteIdentity a:hover,
#siteIdentity a:focus {
  text-decoration: underline;
}

@media (max-width: 32em) {
  #branding {
    width: 50%;
  }
}

#siteIdentity a {
  display: block;
}

/* main navigation */

nav {
  width: calc(100% - 15rem);
  float: right;
}

@media (max-width: 32em) {
  nav {
    width: 50%;
  }
}

@media (max-width: 27em) {
  nav {
    padding: 1.75rem 0 1.5rem;
  }
}

#menu-main-menu {
  -ms-flex-pack: end;
  flex-pack: end;
  -webkit-justify-content: flex-end;
  -moz-justify-content: flex-end;
  -ms-justify-content: flex-end;
  justify-content: flex-end;
  font-family: Helvetica, Arial, sans-serif;
  font-weight: 600;
}

/* function */
/* https://codepen.io/scottb/pen/gixIv */
ul#menu-main-menu li > ul {
  display: none;
  position: absolute;
  top: 100%;
  background: #fff;
  padding: 0;
}

ul#menu-main-menu li.menu-item-has-children:not(.visible) > ul {
  display: none;
}

body.has-hover ul#menu-main-menu li.menu-item-has-children:hover > ul,
ul#menu-main-menu li.menu-item-has-children.visible > ul {
  display: block;
}

body.has-hover ul#menu-main-menu li.menu-item-has-children:hover > ul ul.sub-menu,
ul#menu-main-menu li.menu-item-has-children.visible > ul ul.sub-menu {
  position: relative;
}

.sub-menu > li {
  display: block;
  position: relative;
}

ul#menu-main-menu li > ul > li a {
  text-decoration: none;
  padding: .5em 1em;
  display: block;
  max-width: 100%;
  white-space: normal;
}

ul#menu-main-menu li.menu-item-has-children > a {
  padding-right: 1.75rem;
}

ul#menu-main-menu li.menu-item-has-children::after {
  content: ' ';
  display: block;
  position: absolute;
  width: .5rem;
  height: .5rem;
  right: 1rem;
  top: calc(50% - .25rem);
  border-style: solid;
  border-color: #afacd1;
  border-width: 0 .15rem .15rem 0;
  -webkit-transform: rotate(45deg) translate(-25%,-25%);
  -ms-transform: rotate(45deg) translate(-25%,-25%);
  transform: rotate(45deg) translate(-25%,-25%);
}

ul#menu-main-menu li.menu-item-has-children.visible::after {
  top: calc(50% - .4rem);
  -webkit-transform: rotate(225deg) translate(-25%,-25%);
  -ms-transform: rotate(225deg) translate(-25%,-25%);
  transform: rotate(225deg) translate(-25%,-25%);
}

ul#menu-main-menu li.menu-item-has-children li.menu-item-has-children::after {
  top: 1.35rem;
}

ul#menu-main-menu li.menu-item-has-children li.menu-item-has-children.visible::after {
  top: 1.25rem;
}

/* link styles */

#menu-main-menu > li > a {
  text-transform: uppercase;
}

.menu-main-menu-container > #menu-main-menu > li > a,
.menu-main-menu-container > #menu-main-menu > li > button {
  padding: 2rem 1.25rem;
}

@media (max-width: 27em) {
  .menu-main-menu-container > #menu-main-menu > li > a,
  .menu-main-menu-container > #menu-main-menu > li > button {
    padding: 1.5rem 1.25rem;
  }
}

.menu-main-menu-container > #menu-main-menu > li.menu-item-has-children {
  padding-right: 2.25rem;
}

.menu-main-menu-container > #menu-main-menu > li.menu-item-has-children > a,
.menu-main-menu-container > #menu-main-menu > li.menu-item-has-children > button {
  padding-right: 0;
}

.menu-main-menu-container > #menu-main-menu > li > .sub-menu a {
  text-align: left;
  color: #000;
  font-family: Helvetica, Arial, sans-serif;
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.25;
  padding: 1rem 1.5rem;
}

.menu-main-menu-container > #menu-main-menu > li > .sub-menu > li.menu-item-has-children > a {
  padding: 1rem 0 1rem 1.5rem;
  width: calc(100% - 2.5rem);
}
.menu-main-menu-container > #menu-main-menu > li > .sub-menu > li.menu-item-has-children:hover,
.menu-main-menu-container > #menu-main-menu > li > .sub-menu a:hover,
.menu-main-menu-container > #menu-main-menu > li > .sub-menu a:focus {
  background-color: #ffffff;
}

.menu-main-menu-container > #menu-main-menu > li > .sub-menu a:hover,
.menu-main-menu-container > #menu-main-menu > li > .sub-menu a:focus {
  text-decoration: underline;
  color: #afacd1;
}

ul#menu-main-menu li.menu-item-has-children > a::after,
ul#menu-main-menu li.menu-item-has-children.visible > a::after {
  display: none;
}

#menu-main-menu > li.menu-item-has-children > ul.sub-menu {
  right: .25rem;
  top: 5rem;
  min-width: 20rem;
  background-color: rgba(255, 255, 255, .9);
  -webkit-box-shadow: 0 0 .2rem 0 rgba(50, 50, 50, 0.75);
  -moz-box-shadow: 0 0 .2rem 0 rgba(50, 50, 50, 0.75);
  box-shadow: 0 0 .2rem 0 rgba(50, 50, 50, 0.75);
}

@media (max-width: 27em) {
  #menu-main-menu > li.menu-item-has-children > ul.sub-menu {
    min-width: 18rem;
  }
}

@media (max-width: 19em) {
  #menu-main-menu > li.menu-item-has-children > ul.sub-menu {
    min-width: 100%;
  }
}

ul.sub-menu li > ul.sub-menu {
  top: 0;
  /*background-color: rgba(85, 85, 85, 1); */
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
  font-weight: 400;
  padding-left: .75rem;

}

.menu-main-menu-container > #menu-main-menu > li li,
.menu-main-menu-container > #menu-main-menu > li li li,
.menu-main-menu-container > #menu-main-menu > li li li li {
  margin-left: 0;
}

.menu-main-menu-container > #menu-main-menu > li li > .sub-menu a,
.menu-main-menu-container > #menu-main-menu > li li li > .sub-menu a,
.menu-main-menu-container > #menu-main-menu > li li li li > .sub-menu a {
  font-weight: 400;
  padding-top: .5rem;
  padding-right: 1.5rem;
  padding-bottom: .5rem;
}

.menu-main-menu-container > #menu-main-menu > li li > .sub-menu a {
  padding-left: 2rem;
}

.menu-main-menu-container > #menu-main-menu > li li li > .sub-menu a {
  padding-left: 2.5rem;
}

.menu-main-menu-container > #menu-main-menu > li li li li > .sub-menu a {
  padding-left: 3rem;
}

.menu-main-menu-container > #menu-main-menu > li .sub-menu a:hover,
.menu-main-menu-container > #menu-main-menu > li .sub-menu a:focus {
  text-decoration: none;
}

.menu-main-menu-container > #menu-main-menu > li > ul.sub-menu::before {
  content: "";
  position: absolute;
  right: .35rem;
  top: -.75rem;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 .75rem .75rem .75rem;
  border-color: transparent transparent rgba(255, 255, 255, .9) transparent;
  z-index: 9999;
}

.menu-main-menu-container > #menu-main-menu > li > ul.sub-menu:after {
  content: "";
  position: absolute;
  width: .5rem;
  height: .5rem;
  background: rgba(50, 50, 50, 0.75);
  transform: rotate(45deg);
  right: .85rem;
  top: -.6rem;
  box-shadow: .25rem .25rem .25rem .25rem rgba(50, 50, 50, 0.75);
  z-index: -1;
}
!

JS
!
999px

Console