style.css

*{
    box-sizing: border-box;
    margin: auto;
    padding: 0.5em;
}
body{
    background-image: url("bg.jpg");
    background-repeat: no-repeat;
    background-size: cover;
}
button{
    cursor: pointer;
    font-size:18px;
    border: 0;
    padding: 10px 10px;
    transition: 0.5s;
}
.search-bar{
    display: inline-flex;
}
.card-item{
    width: 400px;
    margin-top: 150px;
    background-color: #fff;
    border-radius: 10px;
}
.intro-section a{
    text-decoration: none;
    color: currentColor;
    transition:0.5s;
}
.card-dp img{
    border: rgb(0, 140, 255) solid 3px;
    border-radius: 500px;
    height:180px;
    width: 180px;
    position: relative;
    top: -100px;
    padding: 0px;
    background-color:white;
}
.card-body{
    margin: auto;
    margin-top:-100px;
}
.connect{
    background-color: rgba(219, 219, 219, 0.575);
    border-radius: 500px;
    margin: 10px;
    transition: 0.5s;
}
.connect:hover{
    background-color: rgba(20, 20, 20, 0.781);
}
button a{
    text-decoration:none;
    color: #fff;
}
button a:hover{
    color: #f3f3f3;
}
@media screen and (max-width: 768px) {
    #app{
        height:100vh;
    }
    .card-item{
        width: 220px;
        margin: auto;
        margin-top: 150px;
        background-color: #fff;
        border-radius: 8px;
    }
    .card-dp img{
        border: rgb(0, 140, 255) solid 3px;
        border-radius: 500px;
        height:120px;
        width: 120px;
        position: relative;
        top: -80px;
        padding: 0px;
        background-color:white;
    }
    .card-body{
        margin: auto;
        margin-top:-100px;
    }
    .connect{
        background-color: rgba(219, 219, 219, 0.575);
        border-radius: 500px;
        margin: 8px;
        transition: 0.5s;
    }
    .connect:hover{
        background-color: rgba(20, 20, 20, 0.781);
    }
    button{
        font-size:18px;
        padding: 8px 8px;
        transition: 0.5s;
    }
    button a{
        font-size:10px;
    }
}