.radio {
    margin: 0.5rem;
}

.radio input[type=radio] {
    position: absolute;
    opacity: 0;
}

.radio input[type=radio] + .radio-label {
    width: 100%;
    position: relative;
    padding-left: 4em;
}

.radio input[type=radio] + .radio-label:before {
    content: "";
    background: #f4f4f4;
    border-radius: 100%;
    border: 1px solid #b4b4b4;
    display: inline-block;
    width: 1.4em;
    height: 1.4em;
    position: absolute;
    top: 50%;
    left: 1.4em;
    margin-right: 1em;
    vertical-align: top;
    cursor: pointer;
    text-align: center;
    transition: all 250ms ease;
    margin-top: -.7em;
}

.radio input[type=radio]:checked + .radio-label:before {
    background-color: #315ba8;
    box-shadow: inset 0 0 0 4px #f4f4f4;
}

.radio input[type=radio] + .radio-label:empty:before {
    margin-right: 0;
}