.container {
    max-width: 950px;
    margin: 0 auto;
    color: gray;
}

.form-example {
    text-align: center;
    margin: 0 auto;
}

.block {
    padding-top: 30px;
}

.title {
    font-size: 40px;
    border-bottom: solid 1px gray;
    padding-top: 50px;
    padding-bottom: 20px;
    text-align: center;
}

.nav {
    border-radius: 7px;
    padding: 15px;
    max-width: 200px;
    float: right;
    background-color: white;
    list-style: none;
}

.parag {
    margin: 0;
    padding: 0;
}


.main_container {
    max-width: 700px;
}
    
input.text_field { 
	border: 1px solid gray;
        width: 25%;
        margin: 0.5rem auto;
        padding: 0.5rem 1.7em;
        border-radius: 0.67em;
        background-color: white;
    }

.button {
        border: 1px solid gray;
        width: 25%;
        padding: 0.4rem 0.9em;
        border-radius: 0.67em;
        background-color: gray;
        color: white;
        margin: 20px auto;
}
.square_background {
    margin: 0 auto;
    background-color: #FFFAFA;
    max-width: 70%;
}

.result {
    margin: 0 auto;
    font-size: 20px;
    padding-top: 3%;
    padding-left: 3%;
    padding-right: 3%;
}

.error_message {
    color: indianred;
}

.anniversary {
    font-size: 15px;
    padding-bottom: 3%;
    padding-left: 3%;
    padding-right: 3%;
}

.border {
    border-bottom: solid 1px gray;
    margin: 60px auto;
}

.border-box {
    max-width: 75%;
    padding: 20px;
    font-size: 18px;
    border: solid 1px gray;
    margin: 0 auto;
}

.section_heading {
    margin: 70px auto;
    padding: 15px 20px;
    background-color: #FFFAFA;
    font-size: 30px;
}


.section_title {
    margin-top: 70px;
}

.return {
    text-align: center;
    font-size: 40px;
}

.subtitle {
    font-size: 12px;
    color: gray;
}

.php_block {
    margin-top: 30px;
}

.head {
    text-align: center;
    margin-top: 100px;
}

.error {
    text-align: center;
    font-size: 30px;
}

.description {
    max-width: 680px;
    margin: 0 auto;
}

.mini_heading {
    margin-left: 10px;
    margin-top: 50px;
    margin-bottom: 50px;
    padding: 1rem 2rem;
    border-left: 10px solid gray;
    background: white;
    font-size: 24px;
    text-align: left;
}

.sentence {
    font-size: 16px;
    max-width: 580px;
    margin: 10px auto;
}

.block {
    margin: 100px auto;
}

.child_li {
    list-style-type: none;
}

.nav_heading {
    margin-top: 25px;
    padding: 6px;
    border-left: 6px solid gray;
    font-size: 14px;
    text-align: left;
}

.nav_list {
    font-size: 12px;
}

.nav_border {
    margin-top: 10px;
    border-bottom: solid 1px gray;
    padding-bottom: 3%;
    text-align: center;
}

.site_link {
    margin-top: 50px;
}

.index_wrapper {
    display: none;
    margin: 0 auto;
}

@media screen and (max-width: 900px) {

    .container {
        max-width: 950px;
        margin: 0 auto;
        color: gray;
    }

    .form-example {
        text-align: center;
        margin: 0 auto;
    }

    .block {
        padding-top: 30px;
    }

    .title {
        font-size: 40px;
        border-bottom: solid 1px gray;
        padding-top: 50px;
        padding-bottom: 20px;
        text-align: center;
    }


    .main_container {
        max-width: 900px;
    }

    input.text_field {
        border: 1px solid gray;
        width: 25%;
        margin: 0.5rem auto;
        padding: 0.5rem 1.7em;
        border-radius: 0.67em;
        background-color: white;
    }

    .button {
        border: 1px solid gray;
        width: 25%;
        padding: 0.4rem 0.9em;
        border-radius: 0.67em;
        background-color: gray;
        color: white;
        margin: 20px auto;
    }
    .square_background {
        margin: 0 auto;
        background-color: #FFFAFA;
        max-width: 70%;
    }

    .result {
        margin: 0 auto;
        font-size: 20px;
        padding-top: 3%;
        padding-left: 3%;
        padding-right: 3%;
    }

    .error_message {
        color: indianred;
    }

    .anniversary {
        font-size: 15px;
        padding-bottom: 3%;
        padding-left: 3%;
        padding-right: 3%;
    }

    .border {
        border-bottom: solid 1px gray;
        margin: 60px auto;
    }

    .border-box {
        max-width: 85%;
        padding: 20px;
        font-size: 18px;
        border: solid 1px gray;
        margin: 0 auto;
    }

    .section_heading {
        margin: 70px auto;
        padding: 15px 20px;
        background-color: #FFFAFA;
        font-size: 30px;
    }

    .section_title {
        margin-top: 70px;
    }

    .return {
        text-align: center;
        font-size: 40px;
    }

    .subtitle {
        maxfont-size: 25px;
        color: gray;
    }

    .php_block {
        margin-top: 30px;
    }

    .error {
        text-align: center;
        font-size: 30px;
    }

    .description {
        max-width: 680px;
        margin: 0 auto;
    }

    .mini_heading {
        margin-left: 10px;
        margin-top: 50px;
        margin-bottom: 50px;
        padding: 1rem 2rem;
        border-left: 10px solid gray;
        background: white;
        font-size: 24px;
        text-align: left;
    }

    .sentence {
        font-size: 16px;
        max-width: 580px;
        margin: 10px auto;
    }

    .block {
        margin: 100px auto;
    }

    .nav {
        display: none;
    }

    .index_li {
        text-align: left;
        padding-bottom: 10px;
    }

    li {
        list-style-type: none;
    }

    .index {
        margin: 0 auto;
        background-color: #FFFAFA;
        padding: 2% 0;
        max-width: 70%;
    }

    .index_heading {
        text-align: left;
    }

    .big_round {
        font-size: 30px;
    }

    a {
        text-decoration: none;
    }

    .index_wrapper {
        display: block;
        margin: 0 auto;
    }
}