.scan_effect
{
    margin:  auto;
    padding: 2px;
    color: lightgray;
    transition: all .8s ease-in-out;
    box-shadow: 0px 0px 50px darkred;
    border-top: 2px solid darkred;
    border-bottom: 2px solid darkred;
    cursor: pointer;
}

.scan_effect:hover
{
    animation: bg 0.1s cubic-bezier(0.19, 1, 0.22, 1) 1;
    background-repeat: no-repeat;
    background-image:   linear-gradient(to right, darkred 100%, darkred 100%),
                        linear-gradient(to bottom, darkred 100%, darkred 100%),
                        linear-gradient(to right, darkred 100%, darkred 100%),
                        linear-gradient(to bottom, darkred 100%, darkred 100%);
    background-size:    100% 3px,
                        3px 100%,
                        300% 2px,
                        3px 100%;
    background-position:    0 0,
                            100% 0,
                            100% 100%,
                            0 100%;
    background-color: darkred;
    box-shadow: 0px 0px 5px darkred;
    color: red;
}