.tool-btn {
    display:block;
    border-radius: 3px;
    border: 1px solid #7a7a7a;
    background: #7a7a7a;
    color: #fff;
    outline: none;
    padding: 15px;
    font-family: inherit;
    margin: 10px 0 0;
    cursor: pointer;
    width: 100%;
}
.tool-btn:hover {
    border: 1px solid #575757;
    background: #909090;
    transition: ease-in-out 0.5s;
}

a {
    color:#575757;
    text-decoration: none;
}