style.css

#container{
    height: auto;
    width: 540px;
    background-color: white;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
    align-content: space-evenly ; 
    margin: 0 auto;
}
#navbar navbar-light{
   margin: 0; 
   padding: 0;
   background: #191919;
}
body{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    background: #34495e;
}
strong{
  margin: auto;
  width: 50%;
  border: 3px solid #3498db;
  padding: 10px;
  border-radius: 50px;
  color: white;
  text-shadow: yellow;
  background: #191919;
   text-align: center;
}
#generate-sudoku{
    margin:auto;
    display:block;;
border-radius: 25px;
transition: 0.25s;
cursor: pointer;
}

#generate-sudoku:hover{
    width: 230px;
    background: red ;
}


#solve{
    margin:auto;
    display:block;
border-radius: 25px;
transition: 0.25s;
cursor: pointer;
}
#solve:hover{
    width: 150px;
    background: green;
}
#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;
    
}

#container div:hover{
    background-color: lightskyblue;
}

.lsb{
    border-left: black 2px solid;
}

.bsb{
    border-bottom: black 2px solid;
}

.rsb{
    border-right: black 2px solid;
}

.tsb{
    border-top: black 2px solid;
}


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

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

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

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