body {
    background:url(../imgs/peris_logo.png) no-repeat center center fixed; 
}

h1 {
    margin-top: 5%;
    text-align: center;
}

.container {
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    justify-content: space-between;
    padding: 10%;
    padding-top: 5%;
}

.app {
    flex: 1 0 40%;
    border-radius: 10px;
    padding: 10px;
    margin: 10px;

    background-color: #dddddd;
    opacity: 0.8;

    h2 {
        text-align: center;
    }

    a {
        color: rgb(0, 0, 238);
        text-decoration: none;
    }
}