http404ntfnd

.side-panel {
visibility: hidden;
opacity: 0;
-webkit-transition: visibility 1s,opacity .5s ease;
-o-transition: visibility 1s opacity .5s ease;
transition: visibility 1s opacity .5s ease;
}

body.side-panel-opened .side-panel {
visibility: visible;
opacity: 1;
}

Можно так

@media (max-width: 1024px) {
  .list-group-service{
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    height: 100px;
  }
}

Значение высоты подберите сами