style.css

/* Clear floats (clearfix hack) */
.btn-group:after {
  content: "";
  clear: both;
  display: table;
}

button:not(:last-child), a>button:not(:last-child) {
  border-right: none; /* Prevent double borders */
}

/* Add a background color on hover */
button:hover, a>button:hover {
  background-color: #3e8e41;
}
a {
  color: white;
}
html {
  font-family: "Century Gothic";
}

#customers {
  font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
  border-collapse: collapse;
  width: 100%;
}

#customers td, #customers th {
  border: 1px solid #ddd;
  padding: 8px;
}

#customers tr:nth-child(even){background-color: #f2f2f2;}

#customers tr:hover {background-color: #ddd;}

#customers th {
  padding-top: 12px;
  padding-bottom: 12px;
  text-align: left;
  background-color: #000000;
  color: white;
}

input[type=text], select {
  width: 100%;
  padding: 12px 20px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

input[type=submit] {
  width: 100%;
  background-color: #4CAF50;
  color: white;
  padding: 14px 20px;
  margin: 8px 0;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

input[type=submit]:hover {
  background-color: #45a049;
}

div {
  border-radius: 5px;
  background-color: #f2f2f2;
  padding: 20px;
}
button, a>button {
  background-color: #4CAF50; /* Green */
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  font-family: "Century Gothic";
  border-radius: 10px;
  height:45px;
  width:170px;
  border: 1px solid green; /* Green border */
  cursor: pointer; /* Pointer/hand icon */
  float: left; /* Float the buttons side by side */
}