body {
    transition: 0.5s;
    background-color: #333;
    background-image: linear-gradient(to bottom right, #005f73, #0a9396);
    background-clip: border-box;
    background-size: cover;
    color: #fff;
    font-family: 'Arial', sans-serif;
    font-size: 16px;
    margin: 0;
    overflow: hidden;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.card {
    transition: 0.5s;
    background-color: #222;
    color: #fff;
    padding: 200px;
    margin: 10px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}
.card:hover {
    transition: 0.5s;
    background-color: #333;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}
.card-header {
    transition: 0.5s;
    text-align: center;
    font-size: 24px;
    margin: 0;
    border-bottom: #fff solid 1px;
}
.card-header:hover {
    transition: 0.5s;
    font-size: 30px;
}
.card-body {
    transition: 0.5s;
    text-align: center;
    font-size: 18px;
    margin: 0;
}
.card-body:hover {
    transition: 0.5s;
    font-size: 24px;
}