slight update to lines and curves positioning

app/assets/stylesheets/pages/pipelines.scss

@@ -321,6 +321,7 @@
           border-top: 2px solid $border-color;
           width: 48px;
           height: 1px;
+          margin-top: -1px;
         }
       }
     }
@@ -498,6 +499,7 @@
         border-top: 2px solid $border-color;
         width: 48px;
         height: 1px;
+        margin-top: -1px;
       }
     }
 
@@ -505,7 +507,7 @@
     &:not(:first-child) {
       &::after, &::before {
         content: '';
-        top: -47px;
+        top: -49px;
         position: absolute;
         border-bottom: 2px solid $border-color;
         width: 25px;
@@ -531,7 +533,7 @@
     &:nth-child(2) {
       &::after, &::before {
         height: 29px;
-        top: -7px;
+        top: -9px;
       }
       .curve {
         display: block;
@@ -589,7 +591,7 @@
       width: 21px;
       height: 25px;
       position: absolute;
-      top: -31.5px;
+      top: -32.5px;
       border-top: 2px solid $border-color;
     }