sudoku-solver.css

*, *::before, *::after 
{
    box-sizing: border-box;
}
.header
{
    display: flex;
    font-size: 3rem;
    font-family:'Courier New', Courier, monospace;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    background: rgba(0,0,0,0.7);
    color: rgba(255,255,255,0.8);
    height: 100px;
}
body
{
    display: grid;
    margin: 0;
    background: linear-gradient(to right, #5b86e5,#36d1dc);
}
.sudoku-board
{
    display: grid;
    width: 100vw;
    height:auto;
    justify-content: center;
    grid-template-columns: repeat(9,50px);
    grid-template-rows: repeat(9,50px);
    align-content: center;
    margin-top: 50px;
}
.cell
{
    display: flex;
    width: 50px;
    height: 50px;
    background-color: transparent;
    border: 1px solid black;
    justify-content: center;
    align-items: center;
}
.cell:nth-child(9n+1)
{
    border-left: 4px solid black;
}
.cell:nth-child(9n+4)
{
    border-left: 4px solid black;
}
.cell:nth-child(9n+7)
{
    border-left: 4px solid black;
}
.cell:nth-child(9n+9)
{
    border-right: 4px solid black;
}
.cell:nth-child(-n+9)
{
    border-top: 4px solid black;
}
.cell:nth-child(-n+9)
{
    border-top: 4px solid black;
}
.cell:nth-child(n+19):nth-child(-n+27)
{
    border-bottom: 4px solid black;
}
.cell:nth-child(n+46):nth-child(-n+54)
{
    border-bottom: 4px solid black;
}

.cell:nth-child(n+73):nth-child(-n+81)
{
    border-bottom: 4px solid black;
}
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input
{
    width: 50px;
    height: 50px;
    background-color: transparent;
    color: rgba(0,0,0,0.9);
    font-weight: 200;
    font-size: 2rem;
    border: none;
    outline: none;
    text-align: center;
    
}
.footer
{
    display: flex;
    justify-content: center;
    margin-top: 40px;
}
button
{
    cursor: pointer;
    border: none;
    outline: none;
    background-color: rgba(0,0,0,0.7);
    color: rgba(255,255,255,0.8);
    font-size: 1rem;
    font-family: 'Times New Roman', Times, serif;
    padding: 10px;
    border-radius: 5px;
    box-shadow: 5px 5px 5px rgba(255,255,255,0.7);
}
button:hover
{
    background-color:rgba(0,0,0,0.4);
    color: black;
    text-shadow: 1.5px 1.5px 3px white;
    box-shadow: none;
}
.reset
{
    margin-left: 20px;
}
.unsol
{
    display: none;
    animation-name: unsolvable;
    animation-duration: 3s;
    position: absolute;
    margin-left: 400px;
    margin-top: 300px;
    animation-timing-function: linear;
}
.unsol > button
{
    border: none;
    background: transparent;
    box-shadow: none;
    outline:none;
    font-size: 100px;
    color: black;
    text-shadow: 1px 1px 10px white;
}
.unsol > button:hover
{
    color: rgba(255,255,255,0.7);
    text-shadow:none;
}
@keyframes unsolvable
{
    0% {
        margin-left: 400px;
        margin-top: 100px;
        }
    20% {
        margin-left: 400px;
        margin-top: 200px;
        }
    40% {
        margin-left: 400px;
        margin-top: 300px;
        }

    60% {
        margin-left: 400px;
        margin-top: 400px;
        }
    80% {
        margin-left: 400px;
        margin-top: 500px;
        }
    100%
    {
        margin-left: 400px;
        margin-top: 300px;
    }
}