style.css

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 250px;
}

header {
  background-color: black;
  color:white;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

h1 {
  text-align: center;
  text-transform: uppercase;
  margin: 0;
  border-bottom: 3px solid darkred;
  white-space: nowrap;
}

#Insert {
  display: flex;
}

.checked {
  text-decoration: overline underline wavy red;;
}

[close] {
  right: 0;
  top: 0;
  padding: 12px 16px 12px 16px;
  color:red;
  background-color: white;
}

[close]:hover {
  background-color: #f44336;
  color: white;
}

/* Clear floats after the header */
.header:after {
  content: "";
  display: table;
  clear: both;
}

input[type='text'] {
  margin: 0;
  border: none;
  border-radius: 0;
  width: 75%;
  padding: 10px;
  float: left;
  font-size: 16px;
}

.myInput {
  font-size: 16px;
  padding: 12px 20px 12px 40px;
  border: 1px solid #ddd;
  display: flex;
  align-items: center;
}

#Add, #Search {
  padding: 10px;
  height: 100%;
  float: left;
  text-align: center;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
  border-radius: 0;
  color:green;
  background-color: white;
  align-self: center;
}

#Add:hover, #Search:hover {
  background-color: green;
  color: white;
}

#Search {
  color:grey;
  background-color: white;
}

#Search:hover {
  background-color: grey;
  color: white;
}

table, th, td {
  border-bottom: 1px solid #ddd;
  text-align: center;
}

table th, table td {
  padding: 12px;
}

table th, h1 {
  background-color: #000;
  color: white;
}

table tr:hover, table tr:hover a {
  background-color: rgb(113, 170, 255);
  color: white;
}
table tr:hover a, table tr:hover span {
  background-color: rgb(255, 165, 21);
  padding: 5px;
  box-shadow: 5px -5px black;
  text-shadow: 1px -1px 0px #000000;
}

table tr a:hover {
  background-color: rgb(255, 217, 0);
  box-shadow: -5px 5px black;
  text-shadow: -1px 1px 0px #000000;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 18px;
}

table td a {
  text-decoration: none;
  color: black;
}