body {
    margin: 0;
    padding: 0;
    padding-top: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.event {
    margin: 5px;
    height: 350px;
    overflow: auto;
    border: 1px solid green;
    border-radius: 12px;
    box-shadow: 6px 6px 6px grey;
    /* Firefox */
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 50, 0.8) rgba(0, 0, 255, 0.4);
}

/* Chrome, Edge, and Safari */
.event::-webkit-scrollbar {
  width: 8px;
}

.event::-webkit-scrollbar-track {
  background: rgba(0, 0, 255, 0.4);
  border-radius: 24px;
}

.event::-webkit-scrollbar-thumb {
  background-color: rgba(0, 0, 50, 0.8);
  border-radius: 12px;
}
/* fin */