:root {
  --size: 60px;
  --border_size: 0.5px;
}
body{
    font-size:60px;
}
#menu{
    display: block;
    background: wheat;
    padding: 5px;
}
select {
    display: inline-block;
    width: 100%;
    padding: 5px 2px;
    display: inline-block;
    border: 1px solid #ccc;
    box-sizing: border-box;
    font-size: 60px;
}
button{
    width: 100%;
    font-size: 50px;
}
.square{
    display: inline-block;
    width: 70px;
    height: 70px;
    border-radius: 3px;
    vertical-align: middle;
}
.desc{
    font-size: 40px;
    vertical-align: middle;
}
#grid{
    width: 100%;
    height: auto;
    border: 2px black solid;
    margin-top: 15px;
}
.empty_cell{
    width: var(--size);
    height: var(--size);
    border: var(--border_size) black solid;
    background: #ecf0f1;
    user-drag: none; 
    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

.wall{
    width: var(--size);
    height: var(--size);
    background: #1e272e;
    border: var(--border_size) black solid;
    user-drag: none; 
    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

.start{
    touch-action: none;
    width: var(--size);
    height: var(--size);
    border: var(--border_size) black solid;
    background: #27ae60;
    user-drag: none; 
    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

.target{
    width: var(--size);
    height: var(--size);
    border: var(--border_size) black solid;
    background: #e74c3c;
    user-drag: none; 
    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

.closed{
    width: var(--size);
    height: var(--size);
    border: var(--border_size) black solid;
    background: #8e44ad;
    user-drag: none; 
    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

.open{
    width: var(--size);
    height: var(--size);
    border: var(--border_size) black solid;
    background: #1abc9c;
    user-drag: none; 
    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

.path{
    width: var(--size);
    height: var(--size);
    border: var(--border_size) black solid;
    background: #f1c40f;
    user-drag: none; 
    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}
footer{
    font-size: 40px;
}