.square, .circle {
    width: 100px;
    height: 100px;
    display: inline-block;
    float: none;
}

.circle {
    border-radius: 50%;
}

#blockRed {
    background-color: red;
    position: relative;
    top: 10px;
    left: 100px;
}

#blockYellow {
    background-color: yellow;
    position: relative;
    top: 20px;
    left: 10px;
}

#container {
    background-color: blue;
    margin: 0 auto;
    width: 400px;
}

#button {
    display: inline-block;
    outline: 0;
    cursor: pointer;
    text-align: center;
    border: 1px solid #babfc3;
    padding: 7px 16px;
    min-height: 36px;
    min-width: 36px;
    background: #ffffff;
    border-radius: 4px;
    font-weight: 500;
    font-size: 14px;
    box-shadow: rgba(0, 0, 0, 0.05) 0px 1px 0px 0px;
}

p {
    font-family: sans-serif;
}

footer {
    padding: 100px 100px;
}

a:link{
    text-decoration: none;
    color:royalblue;
}