body {
        background-color: #080808;
        height: 100vh;
        width: 100vw;
        margin: 0;
    }

    .main-content {
        height: 100%;
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: opacity .4s ease-out;
    }

    #breathing-button {
        -webkit-animation: breathing 2s ease-out forwards infinite;
        animation: breathing 2s ease-out forwards infinite;
    }

    @-webkit-keyframes breathing {
        0% {
            -webkit-transform: scale(0.9);
            transform: scale(0.9);
        }

        50% {
            -webkit-transform: scale(1);
            transform: scale(1);
        }

        100% {
            -webkit-transform: scale(0.9);
            transform: scale(0.9);
        }
    }

    @keyframes breathing {
        0% {
            -webkit-transform: scale(0.9);
            -ms-transform: scale(0.9);
            transform: scale(0.9);
        }

        50% {
            -webkit-transform: scale(1);
            -ms-transform: scale(1);
            transform: scale(1);
        }

        100% {
            -webkit-transform: scale(0.9);
            -ms-transform: scale(0.9);
            transform: scale(0.9);
        }
    }