header {
    padding: 30px 10%;
    display: flex;
    flex-direction: column;
}

article {
    display: flex;
    flex-direction: column;
}

a{
    padding: 10px;
}

section.flexa {
    display: flex;
    flex-direction: column;
}

@media(min-width:860px) {
    section.flexa {
        flex-direction: row;
    }
}

button {
    background-color: #4CAF50;
    color: white;
    border: #4CAF50;
    padding: 10px;
    border-radius: 10px;
    cursor: pointer;
    margin: 10px;
}

div.kolecko {
    height: 30px;
    width: 30px;
    border-radius: 50%;
    margin: 10px;
}