.loader {
  border: 5px solid #f3f3f3;
  border-top: 5px solid #0f0f0f;
  border-radius: 50%;
  width: 15px;
  height: 15px;
  animation: spin 2s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted black;
}

.tooltip .tooltiptext {
  visibility: hidden;
  background-color: black;
  color: #fff;
  text-align: center;
  padding: 5px 5px;
  border-radius: 6px;

  position: absolute;
  z-index: 1;
  width: 300px;
  top: 100%;
  left: 50%;
  margin-left: -150px;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
}