.star-btn {
    display: inline-flex;
    height: 5%;
    margin: 0px;
    text-decoration: none;
    border: ;
    border-radius: 30px;
    position: fixed;
    top: 35%;
    left: 63%;
    overflow: hidden;
    font-size: 23px;
    line-height: 20px;
    padding: 5px 5px;
	letter-spacing: 2px;
    color: #FFF;
    font-weight: bold;
    text-transform: uppercase; 
    font-family: 'Roboto', Тahoma, sans-serif;
    background: ;
    transition: box-shadow 0.3s, transform 0.3s;
    cursor: pointer;
	z-index: 10;
}
.star-btn:hover,
.star-btn:active,
.star-btn:focus {
    transform: ;
    box-shadow: ;
    color: ;
}
.star-btn:before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: ;
    transition: ;
}
.star-btn:hover:before,
.star-btn:active:before,
.star-btn:focus:before {
    left: 100%;
}