styles.css

@import url('https://fonts.googleapis.com/css?family=Roboto:400,700&display=swap');

*{
    box-sizing: border-box;
}

body{
    font-family: 'Roboto', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
    background-color: rgb(16, 15, 15);
    width: 100%;
    overflow: hidden;
}

.container{
    display: flex;
    height: 90vh;
    margin: 20px;
}

.panel{
    background-size: auto 99%;
    background-position: center;
    background-repeat: no-repeat;
    width: 15vw;
    color: rgb(255, 255, 255);
    margin: 5px;
    opacity: 0.5;
    text-align: center;
    border-radius: 10px;
    cursor: pointer;
    position: relative;
    transition: flex 0.5s, width 0.5s, opacity 0.7s;
}

.panel h3, p{
    color: rgb(255, 255, 255);
    opacity: 0;
}

.panel.active{
    flex: 5;
    width: 50vw;
    opacity: 1;
    transition: flex 0.5s, width 0.5s, opacity 0.7s;

    
}

.panel.active h3{
    opacity: 1;
    transition: opacity 0.5s ease-in 0.5s;
}

.panel.active p{
    opacity: 1;
    transition: opacity 0.5s ease-in 0.5s;
}



@media only screen and (max-width: 767px) {
    /* Add styles for mobile devices here */

    body{
        width: 100%;
        margin-left: 50vw;
        padding: 0;
        margin-right: 25vw;
    }

    .container{
        margin: 0 10px;
    }
    .panel:nth-child(4), 
        .panel:nth-child(5) {
        display: none;
    }

    .panel{
        width: 30vw;
    }    

    .panel:hover{
        width: 90vw;
    }

  }