.a1, .a2 {
    animation: blinking 2s infinite;
}

@keyframes blinking {
    0% {
        color: yellow;
    }

    47% {
        color: red;
    }

    62% {
        color: yellow;
    }

    97% {
        color: red;
    }

    100% {
        color: yellow;
    }
}

/* Navbar container */
.navbar {
    overflow: hidden;
    background-color: #4a4a4a;
    font-family: Arial;
}

    /* Links inside the navbar */
    .navbar a {
        float: left;
        font-size: 15px;
        color: white;
        text-align: center;
        padding: 11px 11px;
        text-decoration: none;
    }

/* The dropdown container */
.dropdown {
    float: left;
    overflow: hidden;
}

    /* Dropdown button */
    .dropdown .dropbtn {
        font-size: 13px;
        border: none;
        outline: none;
        color: white;
        padding: 11px 11px;
        background-color: inherit;
        font-family: inherit; /* Important for vertical align on mobile phones */
        margin: 0; /* Important for vertical align on mobile phones */
    }

    /* Add a red background color to navbar links on hover */
    .navbar a:hover, .dropdown:hover .dropbtn {
        background-color: red;
    }

/* Dropdown content (hidden by default) */
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    border-color: silver;
    border-width: 1px;
    min-width: 300px;
    box-shadow: 0px 8px 16px 0px rgba(0,10,10,0.2);
    z-index: 1;
}

    /* Links inside the dropdown */
    .dropdown-content a {
        float: none;
        color: black;
        padding: 8px 8px;
        text-decoration: none;
        display: block;
        text-align: left;
    }

        /* Add a grey background color to dropdown links on hover */
        .dropdown-content a:hover {
            background-color: #ddd;
        }

/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content {
    display: block;
}