nav {
    background: rgba(0, 0, 0, 0.5);
    border-radius: 5px;
    font-family: 'Open Sans', sans-serif;
    margin: 5px;
}

nav .wide-screen {
    color: rgba(102, 102, 102, 1);
    font-size: 14px;
    font-weight: bold;
    line-height: 24px;
    margin-bottom: 0;
    margin-top: 0;
    text-decoration: none;
}

nav .wide-screen ul {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    list-style: none;
    margin-left: 0;
    margin-top: 0;
    margin-bottom: 0;
    padding-left: 0;
}

nav .wide-screen li {
    display: block;
    margin: 2px;
    padding-right: 5px;
    padding-left: 5px;
}

nav .wide-screen button {
    width: 200px;
}

nav .narrow-screen ul {
    list-style: none;
    margin: 0 20px;
    padding: 0;
}

nav .narrow-screen {
    text-align: center;
}

nav .narrow-screen button {
    width: 90%;
}

@media only screen and (max-width: 320px) {
    nav .wide-screen{
        display: none;
    }
}
@media only screen and (min-width: 321px) and (max-width: 480px) {
    nav .wide-screen{
        display: none;
    }
}
@media only screen and (min-width: 481px) and (max-width: 760px) {
    nav .wide-screen{
        display: none;
    }
}
@media only screen and (min-width: 761px) and (max-width: 960px) {
    nav .narrow-screen{
        display: none;
    }
}
@media only screen and (min-width: 961px) and (max-width: 1200px) {
    nav .narrow-screen{
        display: none;
    }
}
@media only screen and (min-width: 1201px) {
    nav .narrow-screen{
        display: none;
    }
}