style.css

div.tooltip {	
    position: absolute;			
    text-align: center;			
    width: 60px;					
    height: 28px;					
    padding: 2px;				
    font: 12px sans-serif;		
    background: lightsteelblue;	
    border: 0px;		
    border-radius: 8px;			
    pointer-events: none;			
}

p {
    font-size: 0.975em;
    color:#fff;
    
}        

body{
    position: relative;
    background-color: black;
    
}        

#chart{
    overflow:visible;
}

.center {
    position: absolute;
    top:50px;
    left: 50%;
    transform: translateX(-50%);
}

.svg {
    position: absolute;
    top:50%;
    left:50%;
}        


    .buttonGroup {
    display: flex;
    justify-content: center;
    

    }  

    .buttonGroup button{
    width:120px;
    height:30px;
    border-radius: 5px;
    border: none;
    color: #fff;
    font-size: 16px;
    cursor: pointer;   
    outline: none;     
    transition: transform .5s;
    }   

    .buttonGroup button:active{
        transform: scale(1.2);
    }  

    .unselected {
    background-color: rgb(77, 60, 224);

    }

    .selected{
    background-color: rgb(12, 189, 50);
    }

    .buttonGroup button:nth-child(2){
        margin:0 10px;
    }
    .buttonGroup button:nth-child(3){
    margin-right:10px;
    }

    .tooltip {
        display: flex;
        justify-content: center;
        align-items: center;
        background-color: black;
        color: #fff;
        min-width: 120px;
    
    }

    .uploadContainer {
    margin-top: 20px; /* Adjust the space between the title and the upload controls */
}