查看效果图

<style>

:root {
    --thm-font: 'Roboto', sans-serif;
    --heading-font: 'Poppins', sans-serif;
    --thm-base: #ffbc45;
    --thm-base-rgb: 255, 188, 69;
    --thm-primary: #ff5959;
    --thm-primary-rgb: 255, 89, 89;
    --thm-black: #162f62;
    --thm-black-rgb: 22, 47, 98;
}
/* preloader */

.preloader {
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: 999999999;
    background-color: #fff;
    top: 0;
    left: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lds-ripple {
    display: inline-block;
    position: relative;
    width: 80px;
    height: 80px;
}

.lds-ripple div {
    position: absolute;
    border: 4px solid var(--thm-base);
    opacity: 1;
    border-radius: 50%;
    -webkit-animation: lds-ripple 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
    animation: lds-ripple 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}

.lds-ripple div:nth-child(2) {
    -webkit-animation-delay: -0.5s;
    animation-delay: -0.5s;
}

@-webkit-keyframes lds-ripple {
    0% {
        top: 36px;
        left: 36px;
        width: 0;
        height: 0;
        opacity: 1;
    }

    100% {
        top: 0px;
        left: 0px;
        width: 72px;
        height: 72px;
        opacity: 0;
    }
}

@keyframes lds-ripple {
    0% {
        top: 36px;
        left: 36px;
        width: 0;
        height: 0;
        opacity: 1;
    }

    100% {
        top: 0px;
        left: 0px;
        width: 72px;
        height: 72px;
        opacity: 0;
    }
}


</style>
<div class="preloader">
        <div class="lds-ripple">
            <div></div>
            <div></div>
        </div>
    </div>

预览效果