una/modules/boonex/charts/template/css/main.css

.bx-pwropa-button-container {
    width: 100%;
    text-align: center;
}
.bx-pwropa-item-container {
    text-align: center;
}
.bx-pwropa-button-container .bx-pwropa-button {
    float:none;
    width:100px;
    margin:0px auto;
}

.bx_chart-legend {
  width:100%;
  bottom:10%;
}

.bx_chart-legend ul{
 list-style: none;
  margin:0;
  padding:0;
 text-align:center;
}

.bx_chart-legend li {
  cursor:pointer;
  margin: 10px 4px;
  display: inline-table;
}
.bx_chart-legend li span {
  position:relative;
  padding: 6px 20px;
  border-radius:13px;
  color:white;
  z-index:2;
  margin-right:1rem;
}
.bx_chart-legend li:hover {
    cursor:pointer;
}