diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
index eb1ad8b..36ec7c0 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
@@ -8935,8 +8935,17 @@ function updateSpectrumFreqAxis(range) {
 
   const firstHz = Math.ceil(range.visLoHz / stepHz) * stepHz;
   spectrumFreqAxis.innerHTML = "";
+  const leftShiftBtn = document.getElementById("spectrum-center-left-btn");
+  const rightShiftBtn = document.getElementById("spectrum-center-right-btn");
+  if (leftShiftBtn) spectrumFreqAxis.appendChild(leftShiftBtn);
+  if (rightShiftBtn) spectrumFreqAxis.appendChild(rightShiftBtn);
   const axisWidth = spectrumFreqAxis.clientWidth || 0;
-  const edgePad = 6;
+  const buttonReserve = Math.max(
+    leftShiftBtn?.offsetWidth || 0,
+    rightShiftBtn?.offsetWidth || 0,
+    0,
+  );
+  const edgePad = Math.max(6, buttonReserve + 10);
   for (let hz = firstHz; hz <= range.visHiHz + stepHz * 0.01; hz += stepHz) {
     const frac = (hz - range.visLoHz) / range.visSpanHz;
     if (frac < 0 || frac > 1) continue;
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html
index 8955188..9ee5feb 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html
@@ -112,13 +112,14 @@
         <div class="spectrum-wrap">
           <div id="spectrum-bookmark-axis"></div>
           <div id="spectrum-bookmark-side-left" class="spectrum-bookmark-side spectrum-bookmark-side-left" aria-hidden="true"></div>
-          <button id="spectrum-center-left-btn" class="spectrum-edge-shift spectrum-edge-shift-left" type="button" aria-label="Shift spectrum center left">&lsaquo;</button>
           <canvas id="spectrum-canvas"></canvas>
           <div id="spectrum-db-axis" aria-hidden="true"></div>
-          <button id="spectrum-center-right-btn" class="spectrum-edge-shift spectrum-edge-shift-right" type="button" aria-label="Shift spectrum center right">&rsaquo;</button>
           <div id="spectrum-bookmark-side-right" class="spectrum-bookmark-side spectrum-bookmark-side-right" aria-hidden="true"></div>
           <div id="spectrum-tooltip"></div>
-          <div id="spectrum-freq-axis"></div>
+          <div id="spectrum-freq-axis">
+            <button id="spectrum-center-left-btn" class="spectrum-edge-shift spectrum-edge-shift-left" type="button" aria-label="Shift spectrum center left">&lsaquo;</button>
+            <button id="spectrum-center-right-btn" class="spectrum-edge-shift spectrum-edge-shift-right" type="button" aria-label="Shift spectrum center right">&rsaquo;</button>
+          </div>
         </div>
         <div id="spectrum-size-grip" title="Drag to resize spectrum height" aria-label="Resize spectrum height"></div>
         <div id="spectrum-controls">
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css
index e148d26..f38efd2 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css
@@ -2553,9 +2553,8 @@ button:focus-visible, input:focus-visible, select:focus-visible {
     padding-top: 0.45rem;
   }
   .spectrum-edge-shift {
-    top: 0.34rem;
-    width: 1.3rem;
-    height: 1.3rem;
+    width: 1.15rem;
+    height: 1.15rem;
   }
   /* Bookmark side panels need too much horizontal space on narrow screens */
   .spectrum-bookmark-side { display: none !important; }
@@ -2564,10 +2563,10 @@ button:focus-visible, input:focus-visible, select:focus-visible {
     padding: 2px 6px;
   }
   .spectrum-edge-shift-left {
-    left: 0.34rem;
+    left: 0.2rem;
   }
   .spectrum-edge-shift-right {
-    right: 0.34rem;
+    right: 0.2rem;
   }
   #spectrum-bw-row,
   #spectrum-level-row {
@@ -2815,14 +2814,15 @@ button:focus-visible, input:focus-visible, select:focus-visible {
 }
 .spectrum-edge-shift {
   position: absolute;
-  top: 0.42rem;
+  top: 50%;
+  transform: translateY(-50%);
   z-index: 8;
-  width: 1.45rem;
-  height: 1.45rem;
+  width: 1.2rem;
+  height: 1.2rem;
   border: 1px solid color-mix(in srgb, var(--border-light) 85%, transparent);
   background: color-mix(in srgb, var(--card-bg) 82%, transparent);
   color: var(--accent-yellow);
-  border-radius: 0.78rem;
+  border-radius: 999px;
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -2853,13 +2853,13 @@ button:focus-visible, input:focus-visible, select:focus-visible {
   border-color: var(--accent-yellow);
 }
 .spectrum-edge-shift:active {
-  transform: none;
+  transform: translateY(-50%);
 }
 .spectrum-edge-shift-left {
-  left: 0.42rem;
+  left: 0.24rem;
 }
 .spectrum-edge-shift-right {
-  right: 0.42rem;
+  right: 0.24rem;
 }
 #spectrum-freq-axis {
   position: relative;