public/styles/components/_modal.scss

.modal {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: $zIndex-modal;
    background-color: rgba(0, 0, 0, 0.7);
    text-align: left;
    cursor: default;

    .modal__content {
        position: absolute;
        left: 30px;
        top: 50px;
        width: calc(100% - 60px);
        height: calc(100% - 60px);
    }

    .modal__dismiss {
        position: absolute;
        right: -20px;
        top: -40px;
        cursor: pointer;

        background-color: $color300Grey;
        color: $color700Grey;
        padding: 5px 10px;
        border-radius: 3px;
    }
}