www: Make accordion arrow less ugly

- also fix mobile.svg color

Change-Id: I2e30f712f44da8bd329dbca9073809a3ad7fba7d
diff --git a/public/assets/app.css b/public/assets/app.css
index 8d870e8..f8627da 100644
--- a/public/assets/app.css
+++ b/public/assets/app.css
@@ -184,12 +184,13 @@
 }
 
 .accordion-label::after {
-  content: '\2304';
-  font-size: 1.5em;
+  content: '\276E';
+  font-size: 1em;
   width: 1em;
   height: 1em;
   text-align: center;
   transition: all 0.35s;
+  transform: rotate(-90deg);
 }
 
 .accordion-content {
@@ -217,7 +218,7 @@
 }
 
 input[type='checkbox']:checked + .accordion-label::after {
-  transform: rotate(-180deg);
+  transform: rotate(-270deg);
 }
 
 input[type='checkbox']:checked ~ .accordion-content {
diff --git a/public/assets/images/svg/mobile.svg b/public/assets/images/svg/mobile.svg
index 6966580..3308532 100644
--- a/public/assets/images/svg/mobile.svg
+++ b/public/assets/images/svg/mobile.svg
@@ -1,5 +1,5 @@
 <!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
-<svg fill="#000000" height="20px" width="20px" version="1.1" id="Capa_1"
+<svg fill="#e8eaed" height="20px" width="20px" version="1.1" id="Capa_1"
     xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 27.442 27.442" xml:space="preserve">
     <path d="M19.494,0H7.948C6.843,0,5.951,0.896,5.951,1.999v23.446c0,1.102,0.892,1.997,1.997,1.997h11.546