body{
    background: url(img/background.jpg);
    height: 96vh;
    display:flex;
    align-items: center;
    justify-content: center;
}
.app{
    display:flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 4px;
    border: 2px solid rgb(180, 44, 44);
    padding: 32px; 
    position: relative;
}
.board{
    text-align: center;
}
#board{
    margin: 16px;
}
#board button {
    height: 48px;
    width: 48px;
    line-height: 46px;
    font-size: 46px;
    margin: 4px;
}
.div-buttons{
    text-align: center;
}
.div-buttons button{
    background: rgb(180, 44, 44);
    color: white;
    padding: 8px 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    display: block;
    margin: 4px auto;
}
.div-buttons button:hover{
    background: rgb(204, 32, 32);
}
h3{
    margin-bottom: 0;
}
input[type="radio"] {
    display: none;
}
label {
    padding-left: 10px;
    margin-bottom: 8px;
}
label::before{
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    vertical-align: middle;
    margin-left: -10px;
    margin-right: 10px;
    border-radius: 50%;
    box-sizing: border-box;
    cursor: pointer;
    background: rgba(246, 246, 250, 1);
    border: 1px solid rgb(204, 32, 32);
}
input[type="radio"]:checked + label::before{
    background: rgb(204, 32, 32);
}
.modal{
    position: absolute;
    height: 100%;
    width: 100%;
    background: white;
    display: flex;
    text-align: center;
    justify-content: center;
}
.modal-content {
    padding-top: 25%;
}
.modal-content .div-buttons{
    margin-top: 16px;
}
.hidden{
    display: none;
}
.inline {
    display: inline-block;
    margin: 20px;
}
@media (max-width: 600px){
    #board button {
        height: 24px;
        width: 24px;
        margin: 4px;
        text-align: center;
        padding: 0;
        line-height: 22px;
        font-size: 22px;
    }
}
@media only screen and (max-device-width: 600px){
    #board button {
        height: 24px;
        width: 24px;
        margin: 4px;
        text-align: center;
        padding: 0;
        line-height: 22px;
        font-size: 22px;
    }
}