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

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

.logo {
    width: 100px;
    cursor: pointer;
}

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

button {
    color: #fbfcfd;
    padding: 10px 25px;
    background: transparent;
    border: 1px solid #fff;
    border-radius: 20px;
    outline: none;
    cursor: pointer;
    transition-duration: 2s;
    opacity: 100%;
}

button:hover {
    color: black;
    background: rgba(255, 255, 255, 0.8);
}

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

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

.side-bar {
    width: 50px;
    height: 100vh;
    background: linear-gradient(#00545d, #000729);
    position: absolute;
    right: 0;
    top: 0;
}

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

.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 {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-around;
    position: absolute;
    bottom: -70px;
}

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

    50% {
        opacity: 1;
    }

    70% {
        opacity: 1;
    }

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

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

.bubbles img:nth-child(2) {
    animation-delay: 1s;
    width: 65px;
}

.bubbles img:nth-child(3) {
    animation-delay: 6s;
    width: 45px;
}

.bubbles img:nth-child(4) {
    animation-delay: 0s;
    width: 15px;
}

.bubbles img:nth-child(5) {
    animation-delay: 4s;
    width: 55px;
}

.bubbles img:nth-child(6) {
    animation-delay: 5s;
    width: 75px;
}

.bubbles img:nth-child(7) {
    animation-delay: 2s;
    width: 25px;
}

small {
    font-size: large;
}

.top {
    font-size: 55%;
}

.bottom {
    font-size: 120%;
}