body, html {
    height: 100%;
    margin: 0;
    font-family: 'Montserrat', Arial, sans-serif;
    background-color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}
.container {
    width: 100%;
    padding: 20px;
}
h1 {
    font-size: 48px;
    font-weight: 900; /* Use the Black weight */
    color: black;
}
.promise {
    font-family: 'Open Sans', Arial, sans-serif;
    font-size: 24px;
    color: grey;
    margin-top: 10px;
}
.playstore {
    margin-top: 20px;
    cursor: pointer;
    display: inline-block;
}
.playstore img {
    max-width: 100%;
    height: auto;
    border: none;
}

/* Media queries for responsiveness */
@media (max-width: 600px) {
    h1 {
        font-size: 36px;
    }
    .promise {
        font-size: 18px;
    }
    .playstore img {
        width: 80%;
    }
}

@media (min-width: 601px) and (max-width: 1200px) {
    h1 {
        font-size: 42px;
    }
    .promise {
        font-size: 21px;
    }
    .playstore img {
        width: 60%;
    }
}

@media (min-width: 1201px) {
    h1 {
        font-size: 48px;
    }
    .promise {
        font-size: 24px;
    }
    .playstore img {
        width: 100%;
    }
}