@import url('https://fonts.googleapis.com/css2?family=Muli:ital,wght@0,100..900;1,100..900&display=swap');
*{
    padding: 0;
    margin: 0;
    scroll-behavior: smooth;
    box-sizing: border-box;
}

body{
    font-family: "Muli", sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
}
.img1{
    background-image: url('../images/explore\ the\ world.jpg');
}
.img2{
    background-image: url('../images/wildforest.jpg');
}
.img3{
    background-image: url('../images/sunny_beach.jpg');
}
.img4{
    background-image: url('../images/city_on_winter.jpg');
}
.img5{
    background-image: url('../images/mountains&clouds.jpg');
}
.container{
    display: flex;
    width: 90vw;
}
.panel{
    background-size: 100% 100%;
    background-position: center;
    background-repeat: no-repeat;
    height: 80vh;
    cursor: pointer;
    flex: .5;
    border-radius: 50px;
    -webkit-border-radius: 50px;
    -moz-border-radius: 50px;
    -ms-border-radius: 50px;
    -o-border-radius: 50px;
    color: #fff;
    margin: 10px;
    position: relative;
    transition: flex .7s ease-in;
    -webkit-transition: flex .7s ease-in;
    -moz-transition: flex .7s ease-in;
    -ms-transition: flex .7s ease-in;
    -o-transition: flex .7s ease-in;
}
.panel h3{
    font-size: 24px;
    position: absolute;
    bottom: 20px;
    left: 20px;
    margin: 0;
    opacity: 0;
}
.panel.active{
    flex: 5;
}

.panel.active h3{
    opacity: 1;
    transition: opacity .3s ease-in .4s;
    -webkit-transition: opacity .3s ease-in .4s;
    -moz-transition: opacity .3s ease-in .4s;
    -ms-transition: opacity .3s ease-in .4s;
    -o-transition: opacity .3s ease-in .4s;
}
@media screen and (max-width:480px) {
    .container{
        width: 100vw;
    }
    .panel:nth-of-type(4),.panel:nth-of-type(5){
        display: none;
    }
}