* {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

.banner {
  width: 100%;
  height: 100vh;
  background-image: url(images/background.jpg);
  background-position: center;
  background-size: 100% 100%;
  position: relative;
  overflow: hidden;
}
.logo {
  margin-top: 20px;
  width: 200px;
  cursor: pointer;
}
.navbar {
  width: 85%;
  height: 15%;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
button {
  color: #fff;
  padding: 10px 25px;
  background: transparent;
  border-radius: 10% 30% 50% 70%;
  border: 1px solid #ffff;
  cursor: pointer;
}
.content {
  color: #fff;
  position: relative;
  top: 40%;
  left: 45%;
  transform: translateY(-50%);
}
h1 {
  font-size: 4000px;
  margin: 10px 0 30px;
  line-height: 100px;
}
.bubbles img {
  width: 100px;
  animation: bubble 8s linear infinite;
}

.bubbles {
  width: 100px;
  display: flex;
  align-items: center;
  justify-content: space-around;
  position: absolute;
  bottom: -70px;
}
@keyframes bubble {
  0% {
    transform: translateY(0);
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  75% {
    opacity: 1;
  }
  100% {
    transform: translateY(-80vh);
    opacity: 0;
  }
}

.bubbles img:nth-child(1) {
  animation-delay: 2.8s;
  width: 60px;
}
.bubbles img:nth-child(2) {
  animation-delay: 3.5s;
  width: 45px;
}
.bubbles img:nth-child(3) {
  animation-delay: 5s;
  width: 90px;
}
.bubbles img:nth-child(4) {
  animation-delay: 8s;
  width: 50px;
}
.bubbles img:nth-child(5) {
  animation-delay: 2s;
  width: 95px;
}
.bubbles img:nth-child(6) {
  animation-delay: 3s;
  width: 40px;
}
.bubbles img:nth-child(7) {
  animation-delay: 8s;
  width: 120px;
}
.bubbles img:nth-child(8) {
  animation-delay: 5s;
  width: 70px;
}
.bubbles img:nth-child(9) {
  animation-delay: 7s;
  width: 80px;
}
.bubbles img:nth-child(10) {
  animation-delay: 2s;
  width: 75px;
}
.bubbles img:nth-child(11) {
  animation-delay: 3s;
  width: 40px;
}
.bubbles img:nth-child(12) {
  animation-delay: 6s;
  width: 80px;
}
.bubbles img:nth-child(13) {
  animation-delay: 5s;
  width: 70px;
}
.bubbles img:nth-child(14) {
  animation-delay: 2s;
  width: 120px;
}
.bubbles img:nth-child(15) {
  animation-delay: 4s;
  width: 95px;
}
.bubbles img:nth-child(16) {
  animation-delay: 3s;
  width: 40px;
}
.bubbles img:nth-child(17) {
  animation-delay: 4s;
  width: 120px;
}
.bubbles img:nth-child(18) {
  animation-delay: 5s;
  width: 70px;
}
.bubbles img:nth-child(19) {
  animation-delay: 2.8s;
  width: 80px;
}
.bubbles img:nth-child(20) {
  animation-delay: 8s;
  width: 75px;
}
.bubbles img:nth-child(21) {
  animation-delay: 3s;
  width: 40px;
}
.bubbles img:nth-child(22) {
  animation-delay: 2.8s;
  width: 60px;
}
.bubbles img:nth-child(23) {
  animation-delay: 4.5s;
  width: 45px;
}
.bubbles img:nth-child(24) {
  animation-delay: 5s;
  width: 90px;
}
.bubbles img:nth-child(25) {
  animation-delay: 8s;
  width: 50px;
}
.bubbles img:nth-child(26) {
  animation-delay: 2s;
  width: 95px;
}
.bubbles img:nth-child(27) {
  animation-delay: 3s;
  width: 40px;
}
.bubbles img:nth-child(28) {
  animation-delay: 2s;
  width: 120px;
}
.bubbles img:nth-child(29) {
  animation-delay: 5s;
  width: 70px;
}
.bubbles img:nth-child(30) {
  animation-delay: 7s;
  width: 80px;
}
.bubbles img:nth-child(31) {
  animation-delay: 2s;
  width: 75px;
}
.bubbles img:nth-child(32) {
  animation-delay: 3s;
  width: 40px;
}
.bubbles img:nth-child(33) {
  animation-delay: 2s;
  width: 80px;
}
.bubbles img:nth-child(34) {
  animation-delay: 5s;
  width: 70px;
}
.bubbles img:nth-child(35) {
  animation-delay: 6s;
  width: 120px;
}
.bubbles img:nth-child(36) {
  animation-delay: 4s;
  width: 95px;
}
.bubbles img:nth-child(37) {
  animation-delay: 3s;
  width: 40px;
}
.bubbles img:nth-child(38) {
  animation-delay: 4s;
  width: 120px;
}
.bubbles img:nth-child(39) {
  animation-delay: 5s;
  width: 70px;
}
.bubbles img:nth-child(40) {
  animation-delay: 2.8s;
  width: 80px;
}
.bubbles img:nth-child(41) {
  animation-delay: 2s;
  width: 75px;
}
.bubbles img:nth-child(42) {
  animation-delay: 6s;
  width: 140px;
}
.bubbles img:nth-child(43) {
  animation-delay: 4.8s;
  width: 80px;
}
.bubbles img:nth-child(44) {
  animation-delay: 2.5s;
  width: 65px;
}
.bubbles img:nth-child(45) {
  animation-delay: 3s;
  width: 90px;
}
.bubbles img:nth-child(46) {
  animation-delay: 6s;
  width: 150px;
}
.bubbles img:nth-child(47) {
  animation-delay: 8s;
  width: 75px;
}
.bubbles img:nth-child(48) {
  animation-delay: 6s;
  width: 40px;
}
.bubbles img:nth-child(49) {
  animation-delay: 2s;
  width: 120px;
}
.bubbles img:nth-child(50) {
  animation-delay: 5s;
  width: 70px;
}
.bubbles img:nth-child(51) {
  animation-delay: 7s;
  width: 20px;
}
.bubbles img:nth-child(52) {
  animation-delay: 4s;
  width: 75px;
}
.bubbles img:nth-child(53) {
  animation-delay: 13s;
  width: 40px;
}
.bubbles img:nth-child(54) {
  animation-delay: 8s;
  width: 80px;
}
.bubbles img:nth-child(55) {
  animation-delay: 5s;
  width: 70px;
}
.bubbles img:nth-child(56) {
  animation-delay: 2s;
  width: 60px;
}

.blue800 {
  background-color: #42cef5;
}

.purple800 {
  background-color: rgb(2, 71, 155);
  color: #ffffff;
  font-size: 1.4rem;
}
#scrollToTop {
  position: fixed;
  bottom: 10px;
  left: 320px;
  width: 50px;
  height: 50px;
  border-radius: 10% 30% 50% 70%;
  background-color: #007bff;
  color: white;
  border: none;
  display: none; /* 初始隱藏 */
  align-items: center;
  justify-content: center;
}