index.css

#graph {
    width: 100%;
    height: 600px;
    margin: 0px;
    padding: 0px;
    padding-bottom: 8px;
    overflow: hidden;
}
            
#tooltipbox {
    position: absolute;
    padding: 8px;
    background: #eee;
    box-shadow: 3px 3px 2px darkgray;
    display: none;
}

#results-box {
    padding: 8px;
}
#results-box > b {
    padding: 8px;
}

#time_selector {
    position: absolute;
    z-index: 2;
}

.paddedp {
    padding-left:  64px;
    padding-right: 64px;
}

form {
    padding-top: 8px;
    padding-bottom: 8px;
}

body {
    padding: 8px;
}

.collapsible {
    /*background-color: rgb(144, 171, 186);*/
    background-color: rgb(241, 250, 255);
    color: black;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}

.active, .collapsible:hover {
    /* background-color: rgb(144, 171, 186);*/
    background-color: rgb(206, 238, 255);
}

.collapsible:after {
    content: '\02795'; /* Unicode character for "plus" sign (+) */
    font-size: 13px;
    color: white;
    float: right;
    margin-left: 5px;
}

.active:after {
    content: "\2796"; /* Unicode character for "minus" sign (-) */
}
.content {
    padding: 0 18px;
    max-height: 0;
    overflow: scroll;
    transition: max-height 0.2s ease-out;
    background-color: rgb(242, 245, 246);
}

.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 240px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 5%;
    margin-left: -60px;
    opacity: 0;
    transition: opacity 0.3s;
}
.tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #555 transparent transparent transparent;
} 
.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}