style.css

@import url('https://fonts.googleapis.com/css2?family=Numans&display=swap');

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Numans', sans-serif;
}
#bgVideo {
    position: fixed;
    right: 0;
    bottom: 0;
    min-width: 100%;
    min-height: 100%;
}
.container {
    position: absolute;
    display: flex;
    align-items: center;
    height: 100%;
    width: 100%;
    justify-content: center;
    flex-direction: column;
}
.container h1 {
    letter-spacing: 5px;
    margin-bottom: 45px;
    color: #bde2ea;
}
.container form {
    display: flex;
}
.container form input {
    padding: 18px 25px;
    border: 2px solid #bde2ea;
    color: #fff;
    background: transparent;
    width: 600px;
    border-radius: 24px;
    font-size: 16px;
    letter-spacing: 1px;
}
.container form button {
    color: #bde2ea;
    background: none;
    border: none;
    position: absolute;
    font-size: 18px;
    height: 55px;
    line-height: 55px;
    margin-left: 555px;
    cursor: pointer;
}
.floating {  
    animation-name: floating;
    animation-duration: 3s;
    animation-iteration-count: infinite;
    animation-delay: .5s;
}
@keyframes floating {
    30% { transform: translateY(25px) rotate(2deg); }
    70%  { transform: translateY(25px) rotate(-2deg); }   
}

/*@keyframes floating {
    from { transform: translate(0,  0px); }
    65%  { transform: translate(0, 25px); }
    to   { transform: translate(0, -0px); }    
}*/