main {
    width: 90%;
    margin-left: auto;
    margin-right: auto;
}
a.normal {
    display: block;
    
    margin-bottom: 1em;
    margin-bottom: 1em;
}
summary {
    font-size: x-large;
    margin: 1em 0 1em 0;
    width: 100%;
}
summary.btn {
    display: list-item;
    /* cursor: pointer; */
    font-size: 1.25em;
}

details > summary::after {
    content: " - tap to open";
    
}

details[open] > summary::after {
    color: darkorange;
    content: " - tap to close";
    font-weight: bolder;
    
}
ul.d-flex {
    max-width: 600px;
    list-style: none;
    padding-left: 0;
}