*{
margin:0;
padding:0;
box-sizing:border-box;
}

body{
font-family:sans-serif;
}

#topbar{
height:60px;
display:flex;
justify-content:space-between;
align-items:center;
padding:0 20px;
background:white;
border-bottom:1px solid #ddd;
}

#map{
height:calc(100vh - 60px);
width:100%;
}

button{
padding:10px 15px;
cursor:pointer;
}