.btn8831-container {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 60%;
  margin: 0 auto;
  opacity: 1.0;
}
.button-item {
  margin: 5px;
  opacity: 1;
  width: 88px;
  height: 31px;
}
.button-group a, .button-group iframe {
  width: 88px;
  height: 31px;
}
.button-group img {
  width: 88px;
  height: 31px;
  opacity: 1;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 10px; /* Space between groups */
}

.btn8831-container hr {
  width: 100%;
  border: 0;
  border-top: 1px solid #ccc;
  margin: 10px 0;
}