.table {
  display: none;
}
.equations {
  display:none;
}
.search-input {
  border:3px black;
  outline:none;
  background:lightgray;
  text-align:center;
  
}
.table {
  margin-right:50;
  margin-left:50;
  align-items:center;
}
td, th{
text-align:center;  
}
table {
  border-collapse: collapse;
  width: 100%;
  border-spacing:20;
}

th, td {
  padding: 8px;
  border-bottom: 2px solid #ddd;
}
th {
  color:black;
}
.∆Hide {
  display: none;
  float: left;
}

.∆Show:hover + .∆Hide {
  display: block;
  color: red;
}

.τHide {
  display: none;
  float: left;
}

.τShow:hover + .τHide {
  display: block;
  color: red;
}

.ωHide {
  display: none;
  float: left;
}

.ωShow:hover + .ωHide {
  display: block;
  color: red;
}

.ηHide {
  display: none;
  float: left;
}

.ηShow:hover + .ηHide {
  display: block;
  color: red;
}