.header {
    overflow: hidden;
    background-color: #f1f1f1;
    padding: 20px 10px;
}

.header a {
    float: left;
    color: black;
    text-align: center;
    padding: 12px;
    text-decoration: none;
    font-size: 18px;
    line-height: 25px;
    border-radius: 4px;
}

.header a.logo {
    font-size: 25px;
    font-weight: bold;
}

.header a:hover {
    background-color: #ddd;
    color: black;
}

.header a.active {
    background-color: dodgerblue;
    color: white;
}

.header-right {
    float: right;
}

@media screen and (max-width: 500px) {
    .header a {
        float: none;
        display: block;
        text-align: left;
    }

    .header-right {
        float: none;
    }
}

.select-style {
    border: 1px solid #ccc;
    width: 120px;
    border-radius: 3px;
    overflow: hidden;
}

.select-style select {
    padding: 5px 8px;
    width: 130%;
    border: none;
    box-shadow: none;
    background: transparent;
    background-image: none;
    -webkit-appearance: none;
}

.select-style select:focus {
    outline: none;
}