:root {
    --text-color: #fff;
    --name-size: 66px;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
}

a {
    text-decoration: none;
    color: var(--text-color);
    cursor: pointer;
}

#background_div {
    overflow: hidden;
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: url('../img/city_opt_micro-min.jpg');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
}

#particles-js {
    overflow: hidden;
    position: absolute;
    width: 100%;
    height: 100%;
}

.container_center {
    display: none;
    text-align: center;
    position: absolute;
    top: 40%;
    right: 20%;
    left: 20%;
}

.name {
    font-size: var(--name-size);
}