.bg-bubbles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

    .bg-bubbles li {
        position: absolute;
        list-style: none;
        display: block;
        width: 40px;
        height: 40px;
        background-color: white;
        opacity: 0.15;
        bottom: -160px;
        -webkit-animation: square 35s infinite;
        animation: square 35s infinite;
        -webkit-transition-timing-function: linear;
        transition-timing-function: linear;
        -webkit-clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
        clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
    }

        .bg-bubbles li:nth-child(1) {
            left: 10%;
        }

        .bg-bubbles li:nth-child(2) {
            left: 20%;
            width: 80px;
            height: 80px;
            animation-delay: 2s;
            animation-duration: 20s;
        }

        .bg-bubbles li:nth-child(3) {
            left: 25%;
            animation-delay: 4s;
        }

        .bg-bubbles li:nth-child(4) {
            left: 40%;
            width: 60px;
            height: 60px;
            animation-duration: 28s;
            background-color: white;
            opacity: 0.25;
        }

        .bg-bubbles li:nth-child(5) {
            left: 70%;
        }

        .bg-bubbles li:nth-child(6) {
            left: 80%;
            width: 120px;
            height: 120px;
            animation-delay: 3s;
            background-color: white;
            opacity: 0.2;
        }

        .bg-bubbles li:nth-child(7) {
            left: 32%;
            width: 160px;
            height: 160px;
            animation-delay: 7s;
        }

        .bg-bubbles li:nth-child(8) {
            left: 55%;
            width: 20px;
            height: 20px;
            animation-delay: 15s;
            animation-duration: 40s;
        }

        .bg-bubbles li:nth-child(9) {
            left: 25%;
            width: 10px;
            height: 10px;
            animation-delay: 2s;
            animation-duration: 40s;
            background-color: white;
            opacity: 0.3;
        }

        .bg-bubbles li:nth-child(10) {
            left: 90%;
            width: 160px;
            height: 160px;
            animation-delay: 11s;
        }

@-webkit-keyframes square {
    0% {
        transform: translateY(0);
    }

    100% {
        transform: translateY(-1200px) rotate(600deg);
    }
}

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

    100% {
        transform: translateY(-1200px) rotate(600deg);
    }
}

.login-box, .register-box {
    width: px;
    margin: 3% auto;
}

.bg-login {
    background: linear-gradient(to bottom right, #5392d4 0%, #50a3a2 100%);
    overflow: hidden;
}

.flex-container {
    display: flex;
    flex-direction: row;
    justify-content: center;
    padding-top: 30px;    
  }

.center-block {
    margin-left:auto;
    margin-right:auto;
    display:block;
}