Change download button position so it's not hidden on mobile

frontend/src/app/components/block-fee-rates-graph/block-fee-rates-graph.component.html

@@ -1,7 +1,7 @@
 <div class="full-container">
   <div class="card-header mb-0 mb-md-4">
     <span i18n="mining.block-fee-rates">Block fee rates</span>
-    <button class="btn" style="position: absolute; right: 30px" (click)="onSaveChart()">
+    <button class="btn" style="margin: 0 0 4px 0px" (click)="onSaveChart()">
       <fa-icon [icon]="['fas', 'download']" [fixedWidth]="true"></fa-icon>
     </button>
 

frontend/src/app/components/block-fee-rates-graph/block-fee-rates-graph.component.scss

@@ -59,11 +59,11 @@
   margin-top: 6px;
   display: flex;
   flex-direction: column;
-  @media (min-width: 1130px) {
+  @media (min-width: 991px) {
     position: relative;
     top: -65px;
   }
-  @media (min-width: 830px) and (max-width: 1130px) {
+  @media (min-width: 830px) and (max-width: 991px) {
     position: relative;
     top: 0px;
   }