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

frontend/src/app/components/statistics/statistics.component.html

@@ -4,7 +4,7 @@
       <div class="card mb-3">
         <div class="card-header">
           <i class="fa fa-area-chart"></i> <span i18n="statistics.memory-by-vBytes">Mempool by vBytes (sat/vByte)</span>
-          <button class="btn" style="position: absolute; right: 30px" (click)="onSaveChart('mempool')">
+          <button class="btn" style="margin: 0 0 4px 0px" (click)="onSaveChart('mempool')">
             <fa-icon [icon]="['fas', 'download']" [fixedWidth]="true"></fa-icon>
           </button>
 
@@ -84,7 +84,7 @@
         <div class="card-header">
             <i class="fa fa-area-chart"></i> <span i18n="statistics.transaction-vbytes-per-second">Transaction vBytes per second (vB/s)</span>
         </div>
-        <button class="btn" style="position: absolute; right: 30px" (click)="onSaveChart('incoming')">
+        <button class="btn" style="margin: 0 0 4px 0px" (click)="onSaveChart('incoming')">
           <fa-icon [icon]="['fas', 'download']" [fixedWidth]="true"></fa-icon>
         </button>