* {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: none;
    border: none;
    text-decoration: none;
    text-transform: capitalize;
    transition: .2s linear;
}

body {
    width: 100%;
    display: flex;
    justify-content: center;
    flex-direction: column;
}

/* header section */

.header {
    width: 100%;
    height: 100px;
    text-align: center;
    background-color: #000;
    color: #fff;
    padding: 30px;
}

/* main section */

.container-main {
    padding: 15px 9%;
    padding-bottom: 100px;
    height: 130vh;
}

.container-main .heading {
    text-align: center;
    padding-bottom: 15px;
    color: #000;
    text-shadow: 0 5px 10px rgba(0, 0, 0, .2);
    font-size: 50px;
}

.container-main .box-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
    gap: 25px;
}

.container-main .box-container .box {
    box-shadow: 0 5px 10px rgba(0, 0, 0, .2);
    border-radius: 5px;
    background: #fff;
    text-align: center;
    padding: 30px 20px;
    height: 400px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-direction: column;
    text-align: center;
    overflow: hidden;
}

.container-main .box-container .box:hover {
    box-shadow: 0 10px 15px rgba(0, 0, 0, .3);
    transform: scale(1.03);
}

/* footer section */

footer {
    width: 100%;
    height: 200px;
    background-color: #000;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* responsive css */

@media (max-width:1080px) {
    .container-main {
        height: 190vh;
    }
}


@media (max-width:1040px) {
    .container-main {
        height: 280vh;
    }
}

@media (max-width:686px) {
    .container-main {
        height: 500vh;
    }
}