Help please! with text creeping to right on blog testimonial rotating slider

Site URL: https://www.deliciouscreations.co.uk

Hi

The text on the homepage rotating testimonial slider on my clients site, populated from blog entries, is cutting off slightly on the right hand side - there are 10 testimonials and it starts to happen on the last couple, like it's creeping over to the right slightly on each one. Looks fine on desktop. Can anyone suggest why and which bit of my coding is wrong!

Thank you!

Here is the complete coding for the slider:

/*TESTIMONIAL SLIDER - landing page*/
.sqs-gallery-design-carousel .sqs-gallery-controls .next,
.sqs-gallery-design-carousel .sqs-gallery-controls .previous {
 display: block;
 float: right;
 position: relative;
 top: auto;
 left: -15px;
 right: 15px;
 bottom: auto;
 margin: 0 0 15px 0;
 padding: 0;
 background-color: transparent;
 color: inherit !important;
 font-size: 16px;
 line-height: 16px;
 cursor: pointer;
}
.sqs-gallery-design-carousel .sqs-gallery-controls .next:before {
 font-family: 'squarespace-ui-font';
 font-style: normal;
 speak: none;
 font-weight: normal;
 -webkit-font-smoothing: antialiased;
 content: "\E003";
 text-align: center;
 display: inline-block;
 vertical-align: middle;
}
.sqs-gallery-design-carousel .sqs-gallery-controls .next:before {
 font-size: 64px;
 width: 64px;
 height: 64px;
 line-height: 64px;
}
.sqs-gallery-design-carousel .sqs-gallery-controls .next:before {
 font-size: 32px;
 width: 16px;
 height: 32px;
 line-height: 32px;
}
.sqs-gallery-design-carousel .sqs-gallery-controls .previous {
 margin-right: 10px;
}
.sqs-gallery-design-carousel .sqs-gallery-controls .previous:before {
 font-family: 'squarespace-ui-font';
 font-style: normal;
 speak: none;
 font-weight: normal;
 -webkit-font-smoothing: antialiased;
 content: "\E000";
 text-align: center;
 display: inline-block;
 vertical-align: middle;
}
.sqs-gallery-design-carousel .sqs-gallery-controls .previous:before {
 font-size: 64px;
 width: 64px;
 height: 64px;
 line-height: 64px;
}
.sqs-gallery-design-carousel .sqs-gallery-controls .previous:before {
 font-size: 32px;
 width: 16px;
 height: 32px;
 line-height: 32px;
}
.summary-carousel-pager .previous {
 position: absolute !important;
 left: -15% !important;
 right: inherit !important;
 top: 45% !important;
}
.summary-carousel-pager .next {
 position: absolute !important;
left: inherit !important;
 right: -15% !important;
 top: 45% !important;
}

.summary-excerpt p {
  font-size: 19px !important;
  line-height: 1.6em !important;
  font-style: italic;
  letter-spacing: 0.13;
  text-align: center !important;
  color: hsl(34, 3%, 54%);
}
.sqs-gallery-design-carousel {
  background: hsl(48, 87%, 92%);
  max-width: 800px;
  max-height: 1000px;
  margin: 0 auto;
  position: relative;
  padding: 40px;
}

/*Reduce Testimonial Slider thumbnail size*/
.summary-thumbnail img {  
  max-width: 15%;
  max-height: 15%;
margin: auto;
 }
.summary-thumbnail-container { 
  pointer-events: none !important; 
}
@media screen and (max-width: 767px) {
 .sqs-gallery-design-carousel {
    max-height: 570px;
   min-width: 300px;
  }}
@media screen and (max-width: 767px) {
 .summary-excerpt p {
   padding-left: 0px!important;
padding-right: 20px !important;
   position: relative !important;
   overflow: visible;
   text-align: center !important;
  }}
@media screen and (max-width: 767px) {
 .summary-heading h2 {
   text-align: center !important;
  }}

@media screen and (max-width: 767px) {
.summary-carousel-pager .previous {
 position: relative !important;
 left: -15% !important;
 right: inherit !important;
 top: 25% !important;
}
.summary-carousel-pager .next {
 position: relative !important;
left: inherit !important;
 right: 15% !important;
 top: 25% !important;
  }}