.fg--search {
    background: white;
    position: relative;
    width: 100%;
    margin: 0px;
}

.fg--search input {
    width: 100%;
    padding: 10px 30px 10px 10px;
}

.fg--search button {

    background: transparent;
    border: none;
    cursor: pointer;
    display: inline-block;
    font-size: 20px;
    position: absolute;
    top: 0;
    right: 0;
    padding: 0px 10px 0px 0px;
    z-index: 2;

}

.fg--search input:focus + button .fa-search {
    color: red;
}