Fixed main nav to make it work with the announcement bar

assets/built/global.css

@@ -1,2 +1,2 @@
-a,abbr,acronym,address,applet,article,aside,audio,big,blockquote,body,canvas,caption,cite,code,dd,del,details,dfn,div,dl,dt,em,embed,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hgroup,html,iframe,img,ins,kbd,label,legend,li,mark,menu,nav,object,ol,output,p,pre,q,ruby,s,samp,section,small,span,strike,strong,sub,summary,sup,table,tbody,td,tfoot,th,thead,time,tr,tt,ul,var,video{border:0;font:inherit;font-size:100%;margin:0;padding:0;vertical-align:baseline}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:after,blockquote:before,q:after,q:before{content:"";content:none}img{display:block;height:auto;max-width:100%}html{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;box-sizing:border-box;font-family:sans-serif}*,:after,:before{box-sizing:inherit}a{background-color:transparent}a:active,a:hover{outline:0}b,strong{font-weight:700}dfn,em,i{font-style:italic}h1{font-size:2em;margin:.67em 0}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sup{top:-.5em}sub{bottom:-.25em}img{border:0}svg:not(:root){overflow:hidden}mark{background-color:#fdffb6}code,kbd,pre,samp{font-family:monospace,monospace;font-size:1em}kbd{background:#f6f8fa;border:1px solid rgba(124,139,154,.25);border-radius:6px;box-shadow:inset 0 -1px 0 rgba(124,139,154,.25);font-family:var(--font-mono);font-size:1.5rem;padding:3px 5px}@media (max-width:600px){kbd{font-size:1.3rem}}button,input,optgroup,select,textarea{color:inherit;font:inherit;margin:0}button{border:none;overflow:visible}button,select{text-transform:none}button,html input[type=button],input[type=reset],input[type=submit]{-webkit-appearance:button;cursor:pointer}button[disabled],html input[disabled]{cursor:default}button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}input{line-height:normal}input:focus{outline:none}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{height:auto}input[type=search]{-webkit-appearance:textfield;box-sizing:content-box}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration{-webkit-appearance:none}legend{border:0;padding:0}textarea{overflow:auto}table{border-collapse:collapse;border-spacing:0}td,th{padding:0}html{-webkit-tap-highlight-color:rgba(0,0,0,0);font-size:62.5%}body{text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-moz-font-feature-settings:"liga" on;background:#fff;color:var(--color-darkgrey);font-family:var(--font-sans);font-size:1.6rem;font-style:normal;font-weight:400;letter-spacing:0;line-height:1.6em}::-moz-selection{background:#daf2fd;text-shadow:none}::selection{background:#daf2fd;text-shadow:none}hr{border:0;border-top:1px solid #f0f0f0;display:block;height:1px;margin:2.5em 0 3.5em;padding:0;position:relative;width:100%}audio,canvas,iframe,img,svg,video{vertical-align:middle}fieldset{border:0;margin:0;padding:0}textarea{resize:vertical}::not(.gh-content) blockquote,::not(.gh-content) dl,::not(.gh-content) ol,::not(.gh-content) p,::not(.gh-content) ul{margin:0 0 1.5em}ol,ul{padding-left:1.3em;padding-right:1.5em}ol ol,ol ul,ul ol,ul ul{margin:.5em 0 1em}ul{list-style:disc}ol{list-style:decimal}ol,ul{max-width:100%}li{line-height:1.6em;padding-left:.3em}li+li{margin-top:.5em}dt{color:#daf2fd;float:left;font-weight:500;margin:0 20px 0 0;text-align:right;width:120px}dd{margin:0 0 5px;text-align:left}blockquote{border-left:#daf2fd;margin:1.5em 0;padding:0 1.6em}blockquote small{display:inline-block;font-size:.9em;margin:.8em 0 .8em 1.5em;opacity:.8}blockquote small:before{content:"\2014 \00A0"}blockquote cite{font-weight:700}blockquote cite a{font-weight:400}a{color:#15171a;text-decoration:none}h1,h2,h3,h4,h5,h6{text-rendering:optimizeLegibility;font-weight:600;letter-spacing:-.01em;line-height:1.15;margin-top:0}h1{font-size:4.8rem;font-weight:700;letter-spacing:-.015em;margin:0 0 .5em}@media (max-width:600px){h1{font-size:2.8rem}}h2{font-size:2.8rem;font-weight:700;margin:1.5em 0 .5em}@media (max-width:600px){h2{font-size:2.3rem}}h3{font-size:2.4rem;font-weight:600;margin:1.5em 0 .5em}@media (max-width:600px){h3{font-size:1.7rem}}h4{font-size:2rem;margin:1.5em 0 .5em}@media (max-width:600px){h4{font-size:1.7rem}}h5{font-size:2rem}h5,h6{margin:1.5em 0 .5em}h6{font-size:1.8rem}
+a,abbr,acronym,address,applet,article,aside,audio,big,blockquote,body,canvas,caption,cite,code,dd,del,details,dfn,div,dl,dt,em,embed,fieldset,figcaption,figure,footer,form,h1,h2,h3,h4,h5,h6,header,hgroup,html,iframe,img,ins,kbd,label,legend,li,mark,menu,nav,object,ol,output,p,pre,q,ruby,s,samp,section,small,span,strike,strong,sub,summary,sup,table,tbody,td,tfoot,th,thead,time,tr,tt,ul,var,video{margin:0;padding:0;border:0;font:inherit;font-size:100%;vertical-align:baseline}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:after,blockquote:before,q:after,q:before{content:"";content:none}img{display:block;max-width:100%;height:auto}html{box-sizing:border-box;font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}*,:after,:before{box-sizing:inherit}a{background-color:transparent}a:active,a:hover{outline:0}b,strong{font-weight:700}dfn,em,i{font-style:italic}h1{margin:.67em 0;font-size:2em}small{font-size:80%}sub,sup{position:relative;font-size:75%;line-height:0;vertical-align:baseline}sup{top:-.5em}sub{bottom:-.25em}img{border:0}svg:not(:root){overflow:hidden}mark{background-color:#fdffb6}code,kbd,pre,samp{font-family:monospace,monospace;font-size:1em}kbd{padding:3px 5px;font-family:var(--font-mono);font-size:1.5rem;background:#f6f8fa;border:1px solid rgba(124,139,154,.25);border-radius:6px;box-shadow:inset 0 -1px 0 rgba(124,139,154,.25)}@media (max-width:600px){kbd{font-size:1.3rem}}button,input,optgroup,select,textarea{margin:0;color:inherit;font:inherit}button{overflow:visible;border:none}button,select{text-transform:none}button,html input[type=button],input[type=reset],input[type=submit]{cursor:pointer;-webkit-appearance:button}button[disabled],html input[disabled]{cursor:default}button::-moz-focus-inner,input::-moz-focus-inner{padding:0;border:0}input{line-height:normal}input:focus{outline:none}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{height:auto}input[type=search]{box-sizing:content-box;-webkit-appearance:textfield}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration{-webkit-appearance:none}legend{padding:0;border:0}textarea{overflow:auto}table{border-spacing:0;border-collapse:collapse}td,th{padding:0}html{font-size:62.5%;-webkit-tap-highlight-color:rgba(0,0,0,0)}body{color:var(--color-darkgrey);font-family:var(--font-sans);font-size:1.6rem;line-height:1.6em;font-weight:400;font-style:normal;letter-spacing:0;text-rendering:optimizeLegibility;background:#fff;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-moz-font-feature-settings:"liga" on}::-moz-selection{text-shadow:none;background:#daf2fd}::selection{text-shadow:none;background:#daf2fd}hr{position:relative;display:block;width:100%;margin:2.5em 0 3.5em;padding:0;height:1px;border:0;border-top:1px solid #f0f0f0}audio,canvas,iframe,img,svg,video{vertical-align:middle}fieldset{margin:0;padding:0;border:0}textarea{resize:vertical}::not(.gh-content) blockquote,::not(.gh-content) dl,::not(.gh-content) ol,::not(.gh-content) p,::not(.gh-content) ul{margin:0 0 1.5em}ol,ul{padding-left:1.3em;padding-right:1.5em}ol ol,ol ul,ul ol,ul ul{margin:.5em 0 1em}ul{list-style:disc}ol{list-style:decimal}ol,ul{max-width:100%}li{padding-left:.3em;line-height:1.6em}li+li{margin-top:.5em}dt{float:left;margin:0 20px 0 0;width:120px;color:#daf2fd;font-weight:500;text-align:right}dd{margin:0 0 5px;text-align:left}blockquote{margin:1.5em 0;padding:0 1.6em;border-left:#daf2fd}blockquote small{display:inline-block;margin:.8em 0 .8em 1.5em;font-size:.9em;opacity:.8}blockquote small:before{content:"\2014 \00A0"}blockquote cite{font-weight:700}blockquote cite a{font-weight:400}a{color:#15171a;text-decoration:none}h1,h2,h3,h4,h5,h6{margin-top:0;line-height:1.15;font-weight:600;text-rendering:optimizeLegibility;letter-spacing:-.01em}h1{margin:0 0 .5em;font-size:4.8rem;font-weight:700;letter-spacing:-.015em}@media (max-width:600px){h1{font-size:2.8rem}}h2{margin:1.5em 0 .5em;font-size:2.8rem;font-weight:700}@media (max-width:600px){h2{font-size:2.3rem}}h3{margin:1.5em 0 .5em;font-size:2.4rem;font-weight:600}@media (max-width:600px){h3{font-size:1.7rem}}h4{margin:1.5em 0 .5em;font-size:2rem}@media (max-width:600px){h4{font-size:1.7rem}}h5{font-size:2rem}h5,h6{margin:1.5em 0 .5em}h6{font-size:1.8rem}
 /*# sourceMappingURL=global.css.map */

assets/css/screen.css

@@ -63,6 +63,7 @@ production stylesheet in assets/built/screen.css
 /* ---------------------------------------------------------- */
 
 .viewport {
+    position: relative;
     display: flex;
     flex-direction: column;
     min-height: 100vh;