* {
  margin: 0;
  padding: 0;
}

body {
  background-color: rgb(218, 196, 218);
}

/* global classes */

.button {
  margin-right: 10px;
  display: block;
  padding: 15px;
  font-size: 20px;
  min-width: 100px;
  cursor: pointer;
  background-color: rgb(36, 33, 33);
  color: white;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  transition: 0.3s;
}

.navbar {
  font-size: 40px;
  font-family: sans-serif;
  background-color: rgb(14, 104, 107);
  color: white;
  padding: 10px 20px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* button */

#buttons {
  display: flex;
  justify-content: space-evenly;
}
/* buttton hover effect */
#generate-sudoku:hover,
#solve:hover {
  background-color: white;
  color: black;
}

/* drop down */

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 10px;
  text-decoration: none;
  display: block;
  text-align: center;
  border-radius: 6px;
}
/* dropdown content hover effect */
.dropdown-content a:hover {
  background-color: #ddd;
}

.dropdown:hover .dropdown-content {
  display: block;
}

/* block container */

#container {
  height: auto;
  width: 540px;
  background-color: white;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-evenly;
  align-content: space-evenly;
  margin: 0 auto;
}

#container div {
  background-color: whitesmoke;
  height: 60px;
  width: 60px;
  box-sizing: border-box;
  font-family: sans-serif;
  text-align: center;
  vertical-align: middle;
  line-height: 60px;
  font-size: 30px;
  color: green;
}

/* styling border of block */

.lsb {
  border-left: black 4px solid;
}

.bsb {
  border-bottom: black 4px solid;
}

.rsb {
  border-right: black 4px solid;
}

.tsb {
  border-top: black 4px solid;
}

.ldb {
  border-left: black 0.6px solid;
}

.bdb {
  border-bottom: black 0.6px solid;
}

.rdb {
  border-right: black 0.6px solid;
}

.tdb {
  border-top: black 0.6px solid;
}