.radio {
    position: relative;
}

.radio_input {
    opacity: 0;
}

.radio_label:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 22px;
    height: 22px;
    background-color: transparent;
    border: 1px solid #969696;
    border-radius: 14px;
    z-index: 1;
    transition: border-color 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    box-sizing: inherit;
}
.radio_label:after {
    content: "";
    position: absolute;
    top: 4px;
    left: 4px;
    width: 14px;
    height: 14px;
    background-color: #4095e2;
    border-radius: 50%;
    z-index: 2;
    transform: scale(0, 0);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    box-sizing: inherit;
}
.radio_input:checked + .radio_label:before {
    border-color: green;
}
.radio_input:checked + .radio_label:after {
    transform: scale(1, 1);
}