* {
    margin: 0px;
    padding: 0px;
}

body {
    font-family: Arial, Helvetica, sans-serif;
}

header {
    background-color: lightblue;
    padding: 20px 0px;
}

h1 {
    text-align: center;
}

#condition {
    text-align: center;
    color: red;
    padding: 20px;
}

.container {
    width: 100%;
}

@media (min-width: 401px) {

    .app-area {
        position: relative;
        display: flex;
        width: 50%;
        height: 200px;
        margin: 0 auto;
        border-radius: 10px;
        background-color: #DDDDDD;
    }

    .app-icon {
        position: absolute;
        width: 50%;
        height: 200px;
        text-align: center;
    }

    .app-icon img {
        height: 120px;
        width: 120px;
        margin: 40px auto;
    }

    .app-description {
        position: absolute;
        width: 40%;
        padding-left: 50%;
        padding-top: 60px;
        padding-bottom: 60px;
    }

    .install-link {
        position: absolute;
        width: 100%;
        height: 100%;
        display: block;
    }
}


@media (max-width: 450px) {
    #condition {
        text-align: center;
        color: red;
        padding: 20px;
        font-size:medium;
    }

    .app-area {
        position: relative;
        display: flex;
        width: 80%;
        height: 200px;
        margin: 0 auto;
        border-radius: 10px;
        background-color: #DDDDDD;
    }

    .app-icon {
        position: absolute;
        width: 50%;
        height: 200px;
        text-align: center;
    }

    .app-icon img {
        height: 80px;
        width: 80px;
        margin-top: 60px;
        margin-bottom: 60px;
    }

    .app-description {
        position: absolute;
        width: 40%;
        padding-left: 50%;
        padding-top: 40px;
        padding-bottom: 40px;
    }

    .install-link {
        position: absolute;
        width: 100%;
        height: 100%;
        display: block;
    }
}