corona.css

body {
    font-family: 'Montserrat', sans-serif;
    margin: 40px auto;
    max-width: 650px;
    line-height: 1.6;
    font-size: 18px;
    color: #363636;
    background-color: #f7f7f7;
    padding: 0 10px
}

h1, h2, h3 {
    line-height: 1.2
}

li {
    list-style: none;
}

.small {
    font-size: .8rem;
}

.clickable {
    cursor: pointer;
}

.centerContainer {
    display: flex;
    justify-content: center;
    align-items: center;
}

.country {
    stroke: #aaaaaa;
    fill: rgba(0, 0, 0, 0);
}

.selected {
    stroke: dimgray;
    fill: #17b78c;
}

.grey {
    color: #aaaaaa;
}

hr {
    border-top: 1px dotted #aaaaaa;
}

.button_corona {
    transition-duration: 1.8s;
    font-family: 'Montserrat', sans-serif;
    font-size: 18px;
    color: #363636;
    background-color: rgba(0, 0, 0, 0);
    border: none;
    padding: .8rem 2rem;
    text-align: center;
    text-decoration: none;
    -webkit-box-shadow: 0 5px 40px -10px rgba(0, 0, 0, .57);
    -moz-box-shadow: 0 5px 40px -10px rgba(0, 0, 0, .57);
}

.button_corona:focus {
    outline: none;
}

.clicked {
    transition-duration: .8s;
    color: white;
    background-color: #4CAF50;
    border-radius: 2rem;
    border: none;
    -webkit-box-shadow: 0 5px 40px -10px rgba(0, 0, 0, 0);
    -moz-box-shadow: 0 5px 40px -10px rgba(0, 0, 0, 0);
}

.corona {
    padding: .2rem;
    font-family: 'Montserrat', sans-serif;
    font-size: 1.1rem;
    color: #363636;
    background-color: rgba(0, 0, 0, 0);
    border-color: #aaaaaa;
}

span.clickable {
    white-space: nowrap;
}

.error {
    color: #363636;
    background-color: rgba(256, 0, 0, .3);
}

#home {
    animation: example 1.5s ease-in-out infinite alternate;
}

@keyframes example {
    from {
        -webkit-box-shadow: 0 5px 40px -10px rgba(0, 0, 0, .57);
        -moz-box-shadow: 0 5px 40px -10px rgba(0, 0, 0, .57)
    }
    to {
        -webkit-box-shadow: 0 5px 40px -10px rgba(0, 0, 0, 0);
        -moz-box-shadow: 0 5px 40px -10px rgba(0, 0, 0, 0)
    }
}