Adapting Block Hairline and welcome route to new design

src/components/layout/Block/index.scss

@@ -1,7 +1,7 @@
 .block {
-  width: 100%;
-  overflow: hidden;
+
 }
+
 .xs {
   margin-bottom: $xs;
 }

src/components/layout/Hairline/index.js

@@ -5,7 +5,7 @@ import { border } from '~/theme/variables'
 
 const calculateStyleFrom = (margin: Size) => ({
   width: '100%',
-  height: '2px',
+  height: '1px',
   backgroundColor: border,
   margin: `${getSize(margin)} 0px`,
 })

src/routes/welcome/components/Layout.jsx

@@ -64,7 +64,7 @@ const Welcome = ({ provider }: Props) => (
     <Heading tag="h1" align="center" margin="lg">
       Safe Team Edition
     </Heading>
-    <Heading tag="h4" align="center" margin="lg">
+    <Heading tag="h4" align="center" margin="xl">
       The Gnosis Safe Team Edition is geared towards teams managing <br />
       shared crypto funds. It is an improvement of the existing Gnosis <br />
       MultiSig wallet with redesigned smart contracts, cheaper setup and <br />