собрал две формы

assets/css/gp-style-core.css

@@ -488,7 +488,6 @@ button{
 
   display: block;
 }
-
 .form-input__error{
   margin-top: 4px;
 
@@ -500,11 +499,15 @@ button{
   color: #f60909;
 
   display: none;
+
+  position: relative;
 }
 .form-input__error--absolute{
   position: absolute;
-  top: 50px;
+  bottom: -19.95px;
   left: 0;
+
+  width: 100%;
 }
 .modal-form__content.check .form__input:invalid{
   border-color: #f60909;
@@ -515,6 +518,19 @@ button{
 .modal-form__content.check .form-input-phone__input:invalid + .form-input__error{
   display: block;
 }
+.modal-form__content.check .form-input-phone__input:invalid + .form-input__error--absolute::before{
+  content: '';
+
+  position: absolute;
+  top: -53px;
+  left: -1px;
+
+  width: 100%;
+  height: 48px;
+
+  border-radius: 20px;
+  border: 1px solid #f60909;
+}
 .form-input__phone{
   padding: 12px 16px 12px ;
 
@@ -820,6 +836,8 @@ button{
   overflow: hidden;
 
   transition: height .2s ease-out;
+
+  z-index: 10;
 }
 .form-input-list__block-content.active{
   border: 1px solid var(--background-black);
@@ -1360,9 +1378,11 @@ button{
   transition: opacity .2s ease-out;
   pointer-events: none;
 
-  display: flex;
+  /* display: flex;
   justify-content: center;
-  align-items: center;
+  align-items: center; */
+
+  overflow-y: auto;
 }
 .modal.active{
   opacity: 1;
@@ -1631,6 +1651,8 @@ button{
 }
 
 .modal-form{
+  margin: auto;
+
   width: 600px;
 
   padding: 24px;
@@ -1739,12 +1761,25 @@ button{
   display: flex;
   justify-content: space-between;
 }
+.modal-form-content-line__element{
+  position: relative;
+}
 .modal-form-content__line--two .modal-form-content-line__element{
   width: calc(50% - 12px);
 }
 .modal-form__buttons{
   margin-top: 32px;
 }
+.modal-form__buttons--two{
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.modal-form__buttons--two button,
+.modal-form__buttons--two input{
+  width: calc(50% - 20px);
+}
 /* modal */
 
 /* toggle */