* {
    font-family: Google sans, Arial;
}

html,
body {
    margin: 0;
    padding: 0;
}

.flex-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: white;
    animation: colorSlide 15s cubic-bezier(0.075, 0.82, 0.165, 1) infinite;

}

.flex-container .text-center {
    text-align: center;
}

h1,
h3 {
    margin: 10px;
    cursor: default;

}

h1 > .fade-in,
h3 > .fade-in {
    animation: fadeIn 2s ease infinite;
}

h1 {
    font-size: 8em;
    transition: font-size 200ms ease-in-out;
    border-bottom: 1px dashed white;
    
}

h1 > span#digit1 {
    animation-delay: 200ms;
}

h1 > span#digit2 {
    animation-delay: 300ms;
}

h1 > span#digit3 {
    animation-delay: 400ms;
}

button {
    border: 1px solid white;
    background: transparent;
    outline: none;
    padding: 10px 20px;
    font-size: 1.1rem;
    font-weight: bold;
    color: white;
    text-transform: uppercase;
    transition: background-color 200ms ease-in;
    margin: 20px 0;
    
}

button:hover {
    background-color: white;
    color: #555;
    cursor: pointer;
}

@keyframes colorSlide {
    0% {
        background-color: #152a68;
    }

    25% {
        background-color: royalblue;
    }

    50% {
        background-color: seagreen;
    }

    75% {
        background-color: tomato;
    }

    100% {
        background-color: #152a68;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}