Css loading button

        <div class="btn-container">
          <button  *ngIf="!isLoading">Enter</button>
          <button *ngIf="isLoading"><span class="circle"></span></button>
        </div>

.btn-container {

button{
    background-color: $color-primary;
    color: $color-white;
    max-width: 300px;
    width: 100%;
    border: none;
    outline: none;
    font-family: $font-en-montserrat;
    font-style: normal;
    font-size: 18px;
    list-style: 22px;
    padding: 13px 15px;
    border-radius: 30px;
    text-transform: uppercase;
    box-sizing: border-box;
    margin-top: 20px;

    display: flex;
    justify-content: center;
    align-items: center;
}

}

.circle {
    width: 20px;
    height: 20px;
    display: block;
    border-radius: 50%;
    border: 2px solid rgb(255 255 255 / 0.5);
    border-top-color: $color-white;
    animation: rotate 1s linear infinite;
}

@keyframes rotate {
    100% {
        rotate: 360deg;
    }
}