.btn {
  background-color: transparent;
  border: none;
  margin: 0 2px;
  padding: 1px 1px;
}
.btn:hover, .btn:focus {
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075) inset, 0 0 4px rgba(82, 168, 236, 0.6);
  outline: 0 none;
}
.btn:active {
  background: #ccc; 
}
[tooltip] {
  position: relative;
  display: inline-block;
}

[tooltip]::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  border-width: 4px 6px 0 6px;
  border-style: solid;
  border-color: rgba(0, 0, 0, 0.7) transparent transparent transparent;
  z-index: 99;
  opacity: 0;
  left: 100%;
  top: 50%;
  margin-left: 1px;
  transform: translatey(-50%) rotate(90deg)
}
[tooltip]::after {
  content: attr(tooltip);
  position: absolute;
  left: 50%;
  top: -6px;
  transform: translateX(-50%) translateY(-100%);
  background: rgba(0, 0, 0, 0.7);
  text-align: center;
  color: #fff;
  padding: 4px 2px;
  font-size: 12px;
  min-width: 40px;
  border-radius: 5px;
  pointer-events: none;
  padding: 4px 4px;
  z-index: 99;
  opacity: 0;
  left: 100%;
  top: 50%;
  margin-left: 8px;
  transform: translateX(0%) translateY(-50%);
}
[tooltip]:hover::after,
[tooltip]:hover::before {
  opacity: 1;
  transition-delay: 2.0s;
  transition: all 0.5s;
}