header, h4{
    text-align: center;
}

.menu {
    text-decoration: none;
    padding: 2px;
    border: 1px solid #03312E;
    margin: 2px;
}

.menu:visited {
    color: #02C3BD;
}

.menu:active{
    color: lightgray;
}

body {
    font-family: Arial;
    color: #02C3BD;
}

main {
    width: 1000px;
    margin: 30px auto;
    clear: both;
}

.card a {
    text-decoration: none;
    color: #02C3BD;
}

.card {
    width: 250px;
    float: left;
}

footer{
    color: gray;
    font-size: 10px;
    text-align: right;
}

@media(max-width: 600px) {
    .card img{
        width: 150px;
        height: 100px;
    }

    img{
        width: 250px;
        height: 300px;
    }
}

.centru{
    text-align: center;
}