*{
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI';
}

.hero {
    width: 100%;
    height: 100vh;
    background-image: url(../images/fish-cover.jpg);
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}


.logo {
    width: 150px;
    cursor: pointer;
    margin-top: 40px;
}

.navbar {
    width: 85%;
    height: 15%;
    margin: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.call-to-action {
    color: #fbfcfd;
    padding: 10px 25px;
    background: rgba(0, 255, 255, .1);
    border: 1px solid #fff;
    border-radius: 20px;
    outline: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 700;
    transition: .5s;
}

.call-to-action:hover{
    background-color: rgba(0, 255, 255, .25);
    color: orange;
    transform: scale(1.1);
    
}

.explore{
    background-color: rgba(255, 0, 0, .2);
    color: #fbfcfd;
    padding: 10px 25px;
    border: 1px solid #fff;
    border-radius: 20px;
    outline: none;
    cursor: pointer;
    font-size: 16px;
    transition: 1.1s;
}

.explore:hover{
    background-color: rgba(255, 0, 0, .6);
}

.content {
    color: #fbfcfd;
    position: absolute;
    top: 50%;
    left: 8%;
    transform: translateY(-50%);
    z-index: 2;
}

small{
    font-size: 16px;
}

h1 {
    font-size: 80px;
    margin: 10px 0 30px;
    line-height: 80px;
}

.sidebar {
    width: 50px;
    height: 100vh;
    background: linear-gradient(rgba(0, 84, 93, .6), rgba(0, 7, 41, .8));
    position: absolute;
    right: 0;
    top: 0;
}

.menu {
    display: block;
    width: 25px;
    margin: 40px auto 0;
    cursor: pointer;
}

.social_links img, .useful_links img{
    width: 25px;
    margin: 5px auto;
    cursor: pointer;
}

.social_links{
    width: 50px;
    text-align: center;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

.useful_links{
    width: 50px;
    text-align: center;
    position: absolute;
    bottom: 30px;
}

.bubbles img{
    width: 50px;
    animation: bubble 7s linear infinite;
}

.bubbles img:nth-child(1){
    animation-delay: 2s;
    width: 95px;
}

.bubbles img:nth-child(2){
    animation-delay: 1s;
}

.bubbles img:nth-child(3){
    animation-delay: 3s;
    width: 25px;
}

.bubbles img:nth-child(4){
    animation-delay: 4.5s;
}

.bubbles img:nth-child(5){
    animation-delay: 5s;
    width: 80px;
}

.bubbles img:nth-child(6){
    animation-delay: 6s;
    width: 20px;
}

.bubbles img:nth-child(7){
    animation-delay: 4s;
    width: 35px;
}

.bubbles{
    display: flex;
    align-items: center;
    justify-content: space-around;
    width: 100%;
    position: absolute;
    bottom: -100px;
}

@keyframes bubble{
    0%{
        transform: translateY(0);
        opacity: 0;
    }

    50%{
        opacity: 1;
    }

    70%{
        opacity: 1;
    }

    100%{
        transform: translateY(-80vh);
        opacity: 0;
    }
}