style.css

#chart{
  width: 800px;
  height: 800px;
  background-color: #f7f7f7;
  margin: 25px auto;
  position: relative
}

#tooltip {
  text-align: center;
  border: 1px solid #ccc;
  position: absolute;
  padding: 10px;
  background-color: #fff;
  display: none;
}

#tooltip .metric-date {
  text-decoration: underline;
}

#axis {
  font-size: 18px;
  shape-rendering: geometricPrecision;
}

.button {
            border: none;
            color: white;
            padding: 16px 32px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 16px;
            margin: 4px 2px;
            transition-duration: 0.4s;
            cursor: pointer;
        }

.button1 {
            background-color: yellow; 
            color: black; 
            border: 2px solid #4CAF50;
        }

.button1:hover {
            background-color: #4CAF50;
            color: white;
        }