.loader {
    position: relative;
    top: 0px;
    left: 0px;
    width: 22px;
    height: 22px;
    transition: all 0.2s ease;
    z-index: 1005;
}

.lds-ring {
    display: none;
    position: relative;
    width: 20px;
    height: 20px;
    top: -2px;
    left: 0px;
    z-index: 1006;
}

.lds-ring.active {
    display: block;
}

.lds-ring div {
    box-sizing: border-box;
    display: block;
    position: absolute;
    width: 18px;
    height: 18px;
    border: 3px solid #333;
    border-radius: 50%;
    animation: lds-ring 1.5s cubic-bezier(0.5, 0, 0.5, 1) infinite;
    border-color: #333 transparent transparent transparent;
}
.lds-ring div:nth-child(1) {
    animation-delay: -0.45s;
}
.lds-ring div:nth-child(2) {
    animation-delay: -0.3s;
}
.lds-ring div:nth-child(3) {
    animation-delay: -0.15s;
}

.lds-ring span {
    position: absolute;
    left: 20px;
}
@keyframes lds-ring {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}
/* HTML */
/* <div class="lds-ring">
    <div></div>
    <div></div>
    <div></div>
    <div></div>
</div> */