Update nutri_call.html

nutri_call.html

@@ -608,7 +608,7 @@ legend {
             <div class="nitrogen-container" style="display: flex; gap: 20px;">
                 <!-- Колонка 1: NH4 -->
                 <div class="nitrogen-column">
-        <button class="square-button" id="minus-button" style="font-weight: bold;">(-)</button>
+        <button class="square-button" id="minus-button" style="font-weight: bold;">-</button>
                     <div class="column-header">NH4</div>
                     <div class="nitrogen-group">
                         <input id="profile_nh4" type="number" value="1.0" step="1.0" readonly style="background-color: #f0f0f0; color: #666;">
@@ -620,7 +620,7 @@ legend {
 
                 <!-- Колонка 2: NO3 -->
                 <div class="nitrogen-column">
-        <button class="square-button" id="plus-button" style="font-weight: bold;">(+)</button>
+        <button class="square-button" id="plus-button" style="font-weight: bold;">+</button>
                     <div class="column-header">NO3</div>
                     <div class="nitrogen-group">
                         <input id="profile_no3" type="number" value="8.25" step="0.01" min="0" max="100.001"/>