/* Firefox */
::selection {
    background-color: #00ff00;
}
/* WebKit browsers (Chrome, Safari) */
::-moz-selection {
    background-color: #00ff00;
}
/* header font size */
.fixed-top {
    font-size: 1.2em;
}
.navbar-brand {
    font-size: 1.5em;
}
footer {
    padding: 5px 0;
    padding-top: 7px;
    padding-bottom: 5px;
}
.intro-header {
    text-align: center;
    padding-bottom: 20px;
}
.font-bold {
    font-weight: bold;
    padding-bottom: 15px;
}
.email-wrapper {
    position: relative;
    display: inline-block;
    cursor: pointer;
}
.tooltip {
    position: absolute;
    right: 250%; /* move button to the left of the email icon */
    transform: translateY(-50%);
    background-color: #333;
    color: #fff;
    padding: 6px 10px;
    border-radius: 5px;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 10;
}
.tooltip.show {
    opacity: 1;
}
/* display email below icon in case of mobile */
@media (max-width: 600px) {
    .tooltip {
        right: auto;
        left: 50%;
        top: 130%;
        transform: translateX(-50%);
    }
}