html
{
    margin: 0;
    padding: 0;
}

body 
{
    font-size: 14px;
    color: rgb(18, 204, 133);
    font-family: sans-serif;
}

.main
{
    padding-left: 20px;
    padding-right: 20px;
    margin-left: auto;
    margin-right: auto;
    width: 1200px;
}

.row
{
    margin-left: -15px;
    margin-right: -15px;
}

.head
{
    margin-top: 10px;
    text-align: center;
    font-size: 40px;
    font-weight: 600;
}

.message
{
    text-align: center;
    font-size: 40px;
}

.board
{
    display: flex;
    flex-wrap: wrap;
    margin: 45px auto;
    width: 400px;
    justify-content: center;
}

.boxs
{
    height: 125px;
    width: 125px;
    border: 1px solid #000;
    align-items: center;
    text-align: center;
    display: flex;
    cursor: pointer;
    justify-content: center;
    font-size: 75px;
    line-height: 75px;
}

.boxs:nth-child(3n + 1) 
{
    border-left: none;
}

.boxs:first-child,
.boxs:nth-child(2),
.boxs:nth-child(3) 
{
    border-top: none;
}

.boxs:nth-child(3n + 3) 
{
    border-right: none;
}

.boxs:last-child,
.boxs:nth-child(8),
.boxs:nth-child(7) 
{
   border-bottom: none;
}

.btn
{
    display: flex;
    justify-content: center;
}

.btn_font
{
    font-size: 30px;
    color: black;
    text-decoration: none;
}

.footer
{
    text-align: center;
    font-size: 24px;
    margin-top: 10px;
}