main.css

.btn {
    text-decoration: none;
    font-weight: bold;
    text-align: center;
    font-size: 20px;
    display: block;
    width: 40px;
    height: 40px;
    background: #87CEFA;
    border-radius: 50%;
    color: #111;
    padding: px 0px 15px 0px;
    margin: 10px;
}

div.step {
    margin: 10px;
    background:#fff; 
    padding: 10px 0px 15px 15px; 
    border:1px solid #DDDDDD; 
    border-radius:10px;
}

div.inline {
    display: table-cell;
}

div.stepcontainer {
    overflow: hidden;
    
}

h1 {
    border-left: solid;
    border-left-color: #87CEFA;
    border-left-width: 8px;
    padding-left: 35px;
    margin-left: 27px;
    margin-bottom: 20px;
    font-weight: 500;
    color: #87CEFA;
}

p.instruction {
    font-size: 16px;
    font-weight: 400;
    
}

img {
    animation: colorize 2s cubic-bezier(0, 0, .78, .36) 1;
    background: transparent;
    border: none;
    border-radius: 4px;
    display: block;
    margin: none;
    max-width: 95%;
}


.return {
    text-align: center;
    margin-top: 15px;
    margin-bottom: 15px;
}

@keyframes colorize {
    0% {
        -webkit-filter: grayscale(100%);
        filter: grayscale(100%);
    }
    100% {
        -webkit-filter: grayscale(0%);
        filter: grayscale(0%);
    }
}