.btn1 {
    width: 80px;
    height: 35px;
    background: none;
    border: 2px solid;
    color: whitesmoke;
    text-transform: uppercase;
    cursor: pointer;
    font-size: 14px;
    position: relative;
    margin-left: 6px;
}

.btn1::hover {
    background-color: #ffffff00;
}

.btn1::before,.btn1::after {
    content: "";
    position: absolute;
    width: 14px;
    height: 4px;
    background: #343a40;
    transition: .2s linear;
}

.btn1::before {
    top: -4px;
    left: 10%;
}

.btn1::after {
    bottom: -4px;
    right: 10%;
}

.btn1:hover::before {
    left: 70%;
}

.btn1:hover::after {
    right: 70%;
}