body{
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: #ddafb1;
    /*background-image: linear-gradient(90deg,green,rgb(205, 107, 50),blue,pink); */
    /* background-image:url(https://images.wallpapersden.com/image/download/fire-sunset-at-road-4k_bGdqbGiUmZqaraWkpJRnamtlrWZpaWU.jpg) ; */
}

.navbar {
    background-color: #fd6569;
    background-image: linear-gradient(45deg,  pink,blue,green,orange,red);
    padding: 3px;
    margin: 10px 5px 0px 5px;
    border-radius: 15px;
    font-size: 20px;
    display: flex;
    text-decoration: none;

    
}

.navbar h4{
    margin-right: 5px;
}


.container {
    padding: 10px;
    /* width: fit-content; */
}

.book-container {
    padding: 15px;
    width: 25%;
    background-color: rgb(224, 37, 37);
    border-radius: 10px;
    color: #fcf5f5;
    margin: 30px;
    display: inline-block;
    vertical-align: top;
}
/* book name and author name */
.book-container h3,
.book-container h4 {
    color: #0a0a0a;
}

.book-container-del-btn {
    background-color: #ddafb1;
    color: black;
    border-radius: 5px;
    padding: 10px;
    border: none;
    margin-top: 10px;
    cursor: pointer;
    font-weight: bold;
    
}
/* 1st step in 2nd part */
.add-btn {
    background-color: #fd6569;
    color: black;
    border-radius: 50%;
    padding: 20px 30px;
    border: none;
    font-size: 40px;
    position: fixed;
    bottom: 30px;
    right: 30px;
    cursor: pointer;
}

.popup-overlay {
    background-color: black;
    opacity: 0.8;
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    display: none;
    z-index: 1;
}

/* 2nd part */
.popup-box {
    background-color: #fd6569;
    width: 40%;
    padding: 40px;
    border-radius: 15px;
    position: fixed;
    top: 20%;
    left: 30%;
    display: none;
    z-index: 2;
}

.popup-box h3 {
    font-size: 30px;
    font-weight: lighter;
}


.popup-box input,
.popup-box textarea {
    background-color: transparent;
    border: none;
    width: 100%;
    margin: 10px 0;
    padding: 10px;
    font-size: 18px;
    border-bottom: 2px solid black;
}

.popup-box textarea {
    border: 2px solid black;
    height: 80px;
}

.popup-box input::placeholder,
.popup-box textarea::placeholder {
    color: black;
}

.popup-box input:focus,
.popup-box textarea:focus {
    outline: none;
}

.popup-box button {
    background-color: black;
    color: #fd6569;
    font-weight: bold;
    font-size: 15px;
    border-radius: 5px;
    margin: 5px;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
}