html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

* {
    margin: 0px;
    padding: 0px;
}

body {
    font-family: 'Exo', sans-serif;
}


.context {
    width: 100%;
    position: absolute;
    top: 50vh;
}

    .context h1 {
        text-align: center;
        color: #fff;
        font-size: 50px;
    }


.area {
    background: #4e54c8;
    background: -webkit-linear-gradient(to left, #8f94fb, #4e54c8);
    width: 100%;
    height: 100vh;
}

.circles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

    .circles li {
        position: absolute;
        display: block;
        list-style: none;
        width: 20px;
        height: 20px;
        background: rgba(255, 255, 255, 0.2);
        animation: animate 25s linear infinite;
        bottom: -150px;
    }

        .circles li:nth-child(1) {
            left: 25%;
            width: 80px;
            height: 80px;
            animation-delay: 0s;
        }


        .circles li:nth-child(2) {
            left: 10%;
            width: 20px;
            height: 20px;
            animation-delay: 2s;
            animation-duration: 12s;
        }

        .circles li:nth-child(3) {
            left: 70%;
            width: 20px;
            height: 20px;
            animation-delay: 4s;
        }

        .circles li:nth-child(4) {
            left: 40%;
            width: 60px;
            height: 60px;
            animation-delay: 0s;
            animation-duration: 18s;
        }

        .circles li:nth-child(5) {
            left: 65%;
            width: 20px;
            height: 20px;
            animation-delay: 0s;
        }

        .circles li:nth-child(6) {
            left: 75%;
            width: 110px;
            height: 110px;
            animation-delay: 3s;
        }

        .circles li:nth-child(7) {
            left: 35%;
            width: 150px;
            height: 150px;
            animation-delay: 7s;
        }

        .circles li:nth-child(8) {
            left: 50%;
            width: 25px;
            height: 25px;
            animation-delay: 15s;
            animation-duration: 45s;
        }

        .circles li:nth-child(9) {
            left: 20%;
            width: 15px;
            height: 15px;
            animation-delay: 2s;
            animation-duration: 35s;
        }

        .circles li:nth-child(10) {
            left: 85%;
            width: 150px;
            height: 150px;
            animation-delay: 0s;
            animation-duration: 11s;
        }



@keyframes animate {

    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
        border-radius: 0;
    }

    100% {
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }
}