index.css

/* Global styles */
html, input {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

button {
    border: none;
    border-radius: 2px;
}

.ReactModal__Overlay {
    z-index: 50;
}

.modal-message {
    margin-top: 20px;
}

@keyframes lds-rolling {
    0% {
        -webkit-transform: translate(-50%, -50%) rotate(0deg);
        transform: translate(-50%, -50%) rotate(0deg);
    }
    100% {
        -webkit-transform: translate(-50%, -50%) rotate(360deg);
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

@-webkit-keyframes lds-rolling {
    0% {
        -webkit-transform: translate(-50%, -50%) rotate(0deg);
        transform: translate(-50%, -50%) rotate(0deg);
    }
    100% {
        -webkit-transform: translate(-50%, -50%) rotate(360deg);
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.lds-rolling {
    position: relative;
}

.lds-rolling div,
.lds-rolling div:after {
    position: absolute;
    width: 40px;
    height: 40px;
    border: 6px solid #3398c0;
    border-top-color: transparent;
    border-radius: 50%;
}

.lds-rolling div {
    -webkit-animation: lds-rolling 1.6s linear infinite;
    animation: lds-rolling 1.6s linear infinite;
    top: 25px;
    left: 25px;
}

.lds-rolling div:after {
    -webkit-transform: rotate(90deg);
    transform: rotate(90deg);
}

.lds-rolling {
    text-align: center;
    margin: auto;
    width: 50px !important;
    height: 50px !important;
    -webkit-transform: translate(-25px, -25px) scale(1) translate(25px, 25px);
    transform: translate(-25px, -25px) scale(1) translate(25px, 25px);
}

.loading-container {
    margin: auto;
    text-align: center;
}