*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}
.hero{
    width: 100%;
    height: 100vh;
    background-image: url(background.jpg);
    background-size: cover;
    background-position: center;
    position: relative;
    overflow: hidden;
}
.logo{
    width: 200px;
    cursor: pointer;
}
.navbar{
    width: 85%;
    height: 15%;
    margin: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    float: left;
    
}
button{
    color: #fbfcfd;
    padding: 10px 35px;
    background: none;
    border: 3px solid #f5445f;
    border-radius: 20px;
    outline: #f5445f;
    cursor: pointer;
}
.content{
    color: #fbfcfd;
    position: absolute;
    top: 50%;
    left: 8%;
    transform: translateY(-50%);
    z-index: 2;
}

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

.side-bar{
    width: 100px;
    height: 100vh;
    background: linear-gradient(#131313, #000000);
    position: absolute;
    right: 0;
    top: 0;
}
.menu{
    display: block;
    width: 50px;
    margin: 50px auto 0;
}
.social-links img, .useful-links img{
    width: 60px;
    margin: 10px 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: 75px;
    animation: bubble 11s linear infinite;
    
}
.bubbles{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-around;
    position: absolute;
    top: -80px;
}

@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){
    width: 50px;
    animation-delay: 2s;
}
.bubbles img:nth-child(2){
    width: 20px;
    animation-delay: 1s;
}
.bubbles img:nth-child(3){
    width: 70px;
    animation-delay: 3s;
}
.bubbles img:nth-child(4){
    width: 30px;
    animation-delay: 4.5s;
}
.bubbles img:nth-child(5){
    width: 60px;
    animation-delay: 3s;
}
.bubbles img:nth-child(6){
    width: 90px;
    animation-delay: 6s;
}
.bubbles img:nth-child(7){
    width: 80px;
    animation-delay: 7s;
}