.buttons {
    display: flex;
    justify-content: center;
    padding: 30px
}

.button-kontakt {
    background: #fff;
    border: 1px solid;
}

.button-oferta {
    color: #fff;
    margin-right: 75px;
}

.button {
    --color: #57A773;
    padding: 0.8em 1.7em;
    background-color: transparent;
    border-radius: .3em;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: .5s;
    /*    font-weight: 400;
        font-size: 17px;
        border: 1px solid;
        font-family: inherit;*/
    text-transform: uppercase;
    /*color: var(--color);*/
    color: #fff;
    z-index: 1;
}

.button::before, .button::after {
    content: '';
    display: block;
    width: 50px;
    height: 50px;
    transform: translate(-50%, -50%);
    position: absolute;
    border-radius: 50%;
    z-index: -1;
    background-color: var(--color);
    transition: 1s ease;
}

.button::before {
    top: -1.1em;
    left: -1.1em;
}

.button::after {
    left: calc(100% + 1.1em);
    top: calc(100% + 1.1em);
}

.button:hover::before, .button:hover::after {
    height: 410px;
    width: 410px;
}

.button:hover {
    color: rgb(10, 25, 30);
}

.button:active {
    filter: brightness(.8);
}