a:link {
    color: blue;
    background-color: transparent;
    text-decoration: none;
}

a:visited {
    color: rgb(34, 138, 207);
    background-color: transparent;
    text-decoration: none;
}

a:hover {
    color: red;
    background-color: transparent;
    text-decoration: underline;
}

a:active {
    color: yellow;
    background-color: transparent;
    text-decoration: underline;
}

header {
    background-color: blueviolet;
    color: white;
    text-align: center;
    color: white;
    padding: 10px;
    font-size: 120%;
    top: 0;
    width: 100%;
    position: sticky;
}

body {
    font-family: "Source Sans Pro", sans-serif;
    font-weight: normal;
}

footer {
    background-color: lightcyan;
    bottom: 0;
    color: blueviolet;
    text-align: center;
}

.container {
    display: flex;
    justify-content: space-between;
}

.column {
    flex: 1;
    margin: 10px;
    text-align: left;
}


/* Style the button that is used to open and close the collapsible content */
.collapsible {
    background-color: lightgoldenrodyellow;
    color: black;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
}

/* Add a background color to the button if it is clicked on (add the .active class with JS), and when you move the mouse over it (hover) */
.active,
.collapsible:hover {
    background-color: lightgrey;
}

/* Style the collapsible content. Note: hidden by default */
.content {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: lightcyan;
}

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

.active:after {
    content: "\2796";
    /* Unicode character for "minus" sign (-) */
}


/* Blinking animation */
@keyframes blink {

    0%,
    50%,
    100% {
        opacity: 1;
    }

    25%,
    75% {
        opacity: 0;
    }
}

.blinking-text {
        color: red;
        font-size: 24px;
        font-weight: bold;
        animation: blink 1s infinite; /* 1 second cycle, repeats forever */
    }