main.css

h1, h2, h5, th {
  background-color: rgb(222, 223, 222);
  border-radius: 10px;
  padding: 10px;
  margin: 0
}

input, select, option {
  background-color: rgb(222, 223, 222);
  border: 1px solid gray;
  padding: 5px;
  border-radius: 5px;
}

input:disabled {
  width: 80px;
}

button {
  border-radius: 5px;
  height: 30px;
}

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

.tooltip .tooltiptext {
  visibility: hidden;
  width: 75vw;
  background-color: #555;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 5px 0;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -60px;
  opacity: 0;
  transition: opacity 0.3s;
}

.tooltip .tooltiptext::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: #555 transparent transparent transparent;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
  opacity: 1;
}