header,
.bas {
    background-color: #444;
    margin: auto;
}

body {
    margin: 0;
}

h1 {
    color: red;
    margin: auto;
    font-size: 1.1em;
    text-align: center;
    padding-top: 10px;
}

h2 {
    color: black;
}

header p {
    color: gray;
    font-size: .6em;
    text-align: center;
}

header p+p,
footer p:first-child {
    background-color: gray;
    color: black;
    text-align: left;
    padding: .8em 0 .8em .8em;
}

main {
    font-size: .6em;
    color: gray;
    padding: 0 2.5em 0 2.5em;
}

article {
    padding: .8em 0 .8em 0;
}

.bas {
    text-align: center;
    font-size: .6em;
    padding-top: 1.2em;
    padding-bottom: 1.6em;
    color: white;
}

.bas img {
    width: 30px
}

footer p {
    margin-bottom: 0;
}

@media screen and (min-width: 780px) {
    section {
        display: flex;
        
        padding-bottom: 1em;
        flex-direction:row;
        flex-wrap:wrap;
    }
    article {
        width:50%;
        padding-left: 1em;
    }
}

@media screen and (min-width: 1200px) {
    section {
        padding-bottom: 2em;
    }
    article {
        padding-left: 2em;
        width:25%;
        flex-direction:row;
    }
}