#container {
    display: flex;
}

#controls {
    width: 250px;
    padding: 10px;
    border: 1px solid #ccc;
    margin-right: 10px;
}

#central {
    flex: 1;
}

#orbit {
    width: 400px;
    margin-left: 10px;
}

.control-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
}

input, select {
    width: 100%;
}