main.css

body {
    font-family: sans-serif;
}
/* for headers */
.links-container {
  display: flex;
  justify-content: space-between;
}
/* .flexible-filler { */
/*   flex-grow: 1; */
/* } */
/* CSS for the pull-down section */
.dropdown-content {
    display: none;
    /* position: absolute; */
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    padding: 12px 16px;
    z-index: 1;
}
/* .container { */
/*     display: flex; */
/*     flex-wrap: wrap; */
/* } */

/* .item { */
/*     flex-basis: 50%; /\* Divide container into two equal-width columns *\/ */
/*     box-sizing: border-box; */
/*     padding: 10px; */
/* } */
table {
    max-width: 900px;
    width: 80%;
    border-collapse: collapse;
    background-color: #f9f9f9;
    font-family: monospace;
}

table, th, td {
    border: 1px solid #ddd;
    padding: 2px;
    text-align: left;
}

th {
    background-color: #f2f2f2;
    color: black;
}
.tooltip {
    position: relative;
    display: block;
    cursor: pointer;
}

.tooltip .tooltiptext {
    visibility: hidden;
    /* width: 600px; */
    background-color: #555;
    color: #fff;
    border-radius: 6px;
    padding: 5px 0;

    /* Position the tooltip */
    position: absolute;
    z-index: 1;
    top: 125%; 
    left: 0%;
    margin-left: -300px;
    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}


details {
    border: 1px solid #aaa;
    border-radius: 4px;
    padding: 0.5em 0.5em 0;
}

summary {
    /* font-weight: bold; */
    margin: -0.5em -0.5em 0;
    padding: 0.2em;
}

details[open] {
    padding: 0.5em;
}

details[open] summary {
    border-bottom: 1px solid #aaa;
    margin-bottom: 0.5em;
}