div#dynamic-alerts {
  position: fixed;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(211, 211, 211, 0.4784313725);
  border-radius: 5px;
}
div#dynamic-alerts > div.alert:first-of-type {
  margin-top: 1rem;
}
div#dynamic-alerts {
  z-index: 2003;
}

.alert.message-received {
  max-height: 35em;
  overflow-y: auto;
  color: black;
}

.btn.js-message_read {
  bottom: 0.2em;
  top: auto !important;
  position: sticky !important;
  margin-right: -3em;
  float: right;
}