/* existing styles… */
    #pay-button, #submit-button { width: 48%; display: inline-block; }
    #submit-button { margin-left:4%; }

    #pay-button {
  position: relative;
  background-color: #b3e600;
  color: white;
  font-size: 1rem;
  padding: 0.6em 1.2em;
  border-top: 3px solid #000;
  border-right: 3px solid #000;
  border-bottom: 3px solid #000;
  border-left: none;                /* omit the left side for “75%” */
  border-radius: 6px;
  box-shadow: inset 0 0 10px rgba(0,0,0,0.3), 0 4px 6px rgba(0,0,0,0.2);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}

/* the three little overlapping rectangles */
.icon-stack {
  position: relative;
  width: 1.2em;   /* enough to hold 3 boxes */
  height: 1.2em;
  display: inline-block;
}

.icon-stack .rect {
  position: absolute;
  width: 0.6em;
  height: 0.6em;
  top: 0;
  left: 0;
  border-radius: 2px;
}

.icon-stack .rect.blood   { background: #8A0303; transform: translate(0,0)   scale(0.8); }
.icon-stack .rect.navy    { background: #0B1E5B; transform: translate(0.3em,0.1em) scale(0.8); }
.icon-stack .rect.orange  { background: #FF6600; transform: translate(0.6em,0.2em) scale(0.8); }

/* ensure the amount text stays white */
#pay-button #calc-amount {
  color: white;
}


/*amount calculation*/
/* …existing… */
  #calc-amount {
    font-size: 1.25em;
    font-weight: bold;
  }
  #calc-amount .amt-dec {
    font-size: 0.6em;
    vertical-align: middle;
    margin-left: 2px;
  }