Improve navigation dropdown

website/src/styles/navigation.module.sass

@@ -58,16 +58,6 @@
     flex-flow: row nowrap
     margin-left: 0.5rem
 
-.dropdown
-    font-family: var(--font-secondary)
-    font-size: 1.6rem
-    font-weight: bold
-    color: var(--color-theme)
-    text-transform: uppercase
-    background: transparent
-    border: 0
-    margin-right: 0.5rem
-
 .is-active
     color: var(--color-dark)
     pointer-events: none
@@ -78,6 +68,33 @@
     height: 100%
     padding-right: 2rem
 
+.dropdown
+    font-family: var(--font-secondary)
+    font-size: 1.6rem
+    font-weight: bold
+    color: var(--color-theme)
+    text-transform: uppercase
+    background: transparent
+    border: 0
+    margin-right: 0.5rem
+    appearance: none
+    background-color: var(--color-back)
+    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23929e9b%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E')
+    background-repeat: no-repeat
+    background-position: right 0.7em top 50%
+    background-size: 0.5em auto
+    padding: 0 1.4em 0 0.5em
+    border: 2px solid var(--color-back)
+    border-radius: 2em
+
+    &:-moz-focusring
+        text-shadow: 0 0 0 var(--color-theme)
+        color: transparent
+
+    &:focus
+        border: 2px dotted var(--color-theme)
+        outline: none
+
 @include breakpoint(max, xs)
     .list
         display: none