s, strike{text-decoration:none;position:relative;}
s::before, strike::before {
    top: 50%; /*tweak this to adjust the vertical position if it's off a bit due to your font family */
    background:red; /*this is the color of the line*/
    opacity:.7;
    content: '';
    width: 110%;
    position: absolute;
    height:.2em;
    border-radius:.1em;
    left: -5%;
    white-space:nowrap;
    display: block;
    transform: rotate(-15deg);  
}
s.straight::before, strike.straight::before{transform: rotate(0deg);left:-1%;width:102%;}