* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 62.5%; /* 1rem = 10px */
}

body {
    font-family: "Lato", sans-serif;
    font-weight: 400;
    line-height: 1.7;
    color: #777;
}

.main-title-heading {
    font-size: 2rem;
    text-transform: uppercase;
    font-weight: 800;
    color: #555;
}

.main-title-subheading {
    font-size: 1rem;
    font-weight: 300;
    text-transform: uppercase;
}

.svg-img {
    display: block;
    margin: auto;
}

#clock {
    animation: clockHand 5s infinite linear;
    transform-box: fill-box;
    transform-origin: bottom;
}

#leftTree, #righTree {
    animation: tree 2s ease-in-out infinite alternate;
    transform-box: fill-box;
    transform-origin: bottom;
}

#man {
    animation: manBody 1s ease-in-out infinite alternate;
    transform-box: fill-box;
    transform-origin: bottom;
}

#pc-circle {
    fill: #6ace66;
    stroke-width: 4;
    animation: change-light 4s linear infinite alternate;
}

.footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    height: 35px;
    line-height: 35px;
    background-color: #f5f5f5;
    font-size: 1.3rem;
}

@keyframes clockHand {
    from {
        transform: rotateZ(0deg);
    }
    to {
        transform: rotateZ(-360deg);
    }
}

@keyframes manBody {
    from {
        transform: rotateX(0deg);
    }
    to {
        transform: rotateX(10deg);
    }
}

@keyframes tree {
    from {
        transform: rotateZ(10deg);
    }
    to {
        transform: rotateZ(-20deg);
    }
}

@keyframes change-light {
    0% {
        stroke: #ffffff;
    }
    25% {
        stroke: #0d0d0d;
    }
    75% {
        stroke: #ffffff;
    }
    100% {
        stroke: #000000;
    }
}

/* Media Queries */
@media (min-width: 640px) {
    .main-title-heading {
        font-size: 2rem;
    }
    
    .main-title-subheading {
        font-size: 1rem;
    }
}

@media (min-width: 768px) {
    .main-title-heading {
        font-size: 4rem;
    }
    
    .main-title-subheading {
        font-size: 3rem;
    }
}

@media (min-width: 1024px) {
    .main-title-heading {
        font-size: 5rem;
        font-weight: 900;
    }
    
    .main-title-subheading {
        font-size: 4rem;
    }
}

@media (min-width: 1200px) {
    .main-title-heading {
        font-size: 4rem;
    }
    
    .main-title-subheading {
        font-size: 4rem;
    }
}