Fix some responsive and style

- Fullscreen: center image + add a background color
- Carousel: don't cut informations
- Title location font size
- Style location line height
- Photo reveal effect
- Photo has now a transparent png

src/style/_base.scss

@@ -2,6 +2,7 @@ html {
     font: #{$base-font-size} $font-sans;
     color: $color-text;
     min-width: 320px;
+    overflow-x: hidden;
 }
 body {
     @include font-smooth;
@@ -80,7 +81,7 @@ button {
 // Title: Locations
 .title-location {
     font-family: $font-serif;
-    font-size: rem(68px);
+    font-size: rem(48px);
     line-height: 1;
     color: $color-secondary;
     text-align: center;
@@ -165,7 +166,7 @@ button {
     font-family: $font-serif;
     font-size: rem(24px);
     color: #fff;
-    line-height: 1;
+    line-height: 1.15;
     text-align: center;
 
     a {