body,html{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 5000px;
}
body{
    height: 5000px;
    display: flex;
    justify-content: center;
    align-items: center;
    
    background: url(images/bg.jpg) repeat #000000 center center;
}

#fixed{
    position: fixed;
    top: calc(50% - 200px);
    left: calc(50% - 200px);
}

.field{
    width: 400px;
    height: 400px;
    background-color: rgb(112, 178, 216);
    border-radius: 5px;
    position: relative;
}

.field_cell{
    width:  81.25px;
    height: 81.25px;
    position: absolute;
    border-radius: 3px;
}

.field_cell_null{
    background-color: rgb(92, 216, 247);
}

.field_cell_tile {
    background-color: rgb(0, 78, 130);
    color: white;
    font-size: 42px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: left 0,5s ease, top 0.5s ease;
}

#modal{
    height: 100%;
    width: 100%;
 
    background: rgba(0, 0, 0, 0.5);
    border-radius: inherit;
    color: white;
 
    font-size: 72px;
    
    display: flex;
    justify-content: center;
    align-items: center;
 
    z-index: 1;
    position: relative;
 
    opacity: 0;
    visibility: hidden;
}
 
#modal.modal--visible{
    opacity: 1;
    visibility: visible;
}