app.css

/* Go to google and search css reset and copy this code to css file*/
/* css reset will undo every deault styling of the browser so that different browsers doesn't get different styling */

/* Below is the css reset code */
/* ----------------------------------------------------- */
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}
/* ----------------------------------------------------- */

html{
    box-sizing: border-box;
    font-family: 'Open Sans', sans-serif;
}

body{
    background-color: #60a9ff;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.panel{
    background-color: white;
    border-radius: 10px;
    padding: 15px 25px;
    /* page ka 100% lega */
    width: 100%;
    /* but max width iska 960px hi rhega */
    max-width: 960px;
    display: flex;
    /* styling humlog as a mobile display ko soch ke kr rhe hai baad me specific width ke liye row styling me change ho jaega */
    flex-direction: column;
    text-align: center;
    text-transform: uppercase;
}

.pricing-plan{
    /* har pricing plan class ke baad border lag jaega */
    border-bottom: 1px solid #e1f1ff;
}

.pricing-plan:last-child{
    /* last waale ke baad ka border hta denge kyuki achha nhi lgega dikhne me */
    border-bottom: none;
}

.pricing-img{
    margin-bottom: 25px;
    max-width: 100%;
}

.pricing-header{
    color: #888;
    font-weight: 600;
    letter-spacing: 1px;
}

.pricing-features{
    margin: 50px 0 25px;
    color: #016ff9;
}

.pricing-features-item{
    font-weight: 600;
    letter-spacing: 1px;
    font-size: 12px;
    line-height: 1.5;
    padding: 15px;
    border-top: 1px solid #e1f1ff;
}

.pricing-features-item:last-child{
    border-bottom: 1px solid #e1f1ff;
}

.pricing-price{
    color: #016ff9;
    display: block;
    font-size: 32px;
    font-weight: 700;
}

.pricing-button {
    border: 1px solid #9dd1ff;
    border-radius: 10px;
    color: #348efe;
    display: inline-block;
    padding: 15px 35px;
    text-decoration: none;
    cursor: pointer;
    margin: 25px 0;
    transition: background-color 200ms ease-in-out;
}

.pricing-button:hover, .pricing-button:focus{
    background-color: #e1f1ff;
}

.pricing-button.is-featured{
    background-color: #48aaff;
    color: white;
}

/* focus krne se kya hota hai */
/* jab button pe click kroge to hover waala hi affect laga rhega jab tak kahi aur click nhi krte */
.pricing-button.is-featured:hover, .pricing-button.is-featured:focus{
    background-color: #269aff;
    color: white;
}

/* jab width 900px ya usse bda hoga to below styling lgega */
@media(min-width: 900px) {
    .panel{
        flex-direction: row;
    }
    .pricing-plan{
        /* jab column se row me change hoga to extra border niche aa jaega */
        /* usko hatane ke liye border bottom one krenge */
        border-bottom: none;
        border-right: 1px solid #e1f1ff;
        padding: 25px 50px;
    }
    /* last wale ka right border hta denge kyuki achha nhi lgega */
    .pricing-plan:last-child{
        border-right: none;
    }
}