html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: lightgray;
}

.plan-container {
    width: 100%;
    height: calc(100vh - 80px);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#plan {
    width: 100%;
    height: 100%;
    display: block;
}

 #controls {
     display: flex;
     justify-content: center;
     align-items: center;
     gap: 10px;
     margin-bottom: 20px;
 }