.book-section {
    background-color: #00163D;
    color: #000 !important;
}

#books {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-wrap: wrap;
}

.book a p {
    margin-bottom: 20px;
    color: #00ffcc !important;
}

.book a:hover > p {
    color: #009966 !important;
}

.book {
    margin: 20px;
    width: fit-content;
    padding: 20px;
    text-align: center;
    background-color: #013162;
    font-weight: 600;
    font-size: 20px;
}

.book p {
    color: #fff !important;
    margin-top: 10px;
}

.book-category {
    display: flex; 
    align-items: center; 
    justify-content: center; 
    flex-direction: row; 
    flex-wrap: wrap;
    color: #fff !important;
}

.options, #welcome-message button {
    display: inline-block;
    padding: 10px 20px;
    margin: 10px;
    margin-bottom: 20px;
    font-weight: 600;
    font-size: 24px;
    background-color: #009966;
    color: #000;
    border-width: 4px;
    border-color: #000;
    border-style: outset;
}

.options:hover, #welcome-message button:hover {
    background-color: #000;
    color: #009966;
    border-color: #000;
    border-style: solid;
}

.options:active, #welcome-message button:active {
    background-color: #000;
    color: #009966;
    border-color: #333;
    border-style: groove;
}

#welcome-message {
    display: flex; 
    flex-direction: column;
    align-items: center;
    justify-content: center; 
    text-align: center; 
    padding: 40px 40px;
    margin: 20px;
    background-color: #013162;
    font-size: 28px;
    font-weight: 700;
}

#welcome-message h3 {
    font-size: 36px;
    margin-bottom: 20px;
    color: #fff !important;
}

#welcome-message p {
    margin-bottom: 20px;
    margin-top: 20px;
    color: #fff !important;
}

#category-buttons {
    text-align: center;
    margin-bottom: 20px;
    margin-top: 20px;
}

.category-btn {
    padding: 10px 20px;
    margin: 10px 10px;
    font-size: 20px;
    font-weight: 600;
    background-color: #009966;
    color: #000;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.category-btn:hover {
    background-color: #006633;
}

.category-btn.active {
    background-color: #fff;
}

.p {
  width: 100%;
  margin: 15px auto;
  text-align: center;
  position: relative;
}

.p p {
  display: inline-block;
  background: #009966;
  padding: 0 15px;
  color: #009966;
  font-weight: 600;
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
}

.p::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 8px;
  background: #009966;
  transform: translateY(-50%);
  z-index: 0;
}

@media screen and (max-width: 400px) {
    .responsive-image {
        width: 180px !important;
        height: auto;
    }
}

@media screen and (max-width: 768px) {
    #RoarSphere-H3 {
        font-size: 30px;
    }
    .arrow {
        display: none;
    }
}