Add common CSS styles

Author: EkaterinaVu

src/assets/css/common.css

@@ -47,6 +47,8 @@ body {
 
 a {
   cursor: pointer;
+  color: inherit;
+  border: 1px solid;
 }
 
 a,
@@ -57,6 +59,11 @@ a:focus {
   text-decoration: none;
 }
 
+a:hover, 
+a:active {
+  border: none;
+}
+
 *,
 *:before,
 *:after {
@@ -71,6 +78,16 @@ ul {
   margin-bottom: 22px;
 }
 
+img {
+  max-width: 100%;
+  height: auto;
+  margin-bottom: 22px;
+}
+
+table {
+  margin-bottom: 22px;
+}
+
 /*utils*/
 .text-thin {
   font-weight: 300;