*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    font-family: 'Poppins', sans-serif;

}

.container{
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column ;
    justify-content: center;
    align-items: center;
    background-color: white;
    color : black;
    transition: all 1s;
}

.container h1 {
    font-size: 3rem;
    margin-bottom: 50px;
}

.container.active{
    background-color: black;
    color : white;
}

.btn.active {
    padding: 10px 20px;
    border: transparent;
    background-color: #ffffff;
    color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: 0.5s;
}

.btn {
    padding: 10px 20px;
    border-radius: 10px;
    border: transparent;
    background-color: #000000;
    color : white;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: 0.5s;
}