*,
*::before,
*::after {
  box-sizing: border-box;
}

img {
  display: block;
  max-width: auto;
  height: auto;
}

h1,
h2,
h3,
p,
i {
  margin-top: 0;
  margin-bottom: 0;
}

ol,
ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

a {
  text-decoration: none;
  background-color: transparent;
}
/* a:link {
  color: blue;
  text-decoration: underline;
   background-color: transparent; 
} */

a:hover {
  color: blue;
  text-decoration: underline;
  background-color: transparent;
}

a:active {
  color: red;
  text-decoration: none;
}

/* a:visited {
  color: purple;
  text-decoration: underline;
  background-color: transparent;
} */

input,
textarea {
  font-family: inherit;
  line-height: inherit;
}

button,
label {
  cursor: pointer;
}

h1 {
  font-size: 5.2vw;
}

h2 {
  font-size: 4.8vw;
}

p,
h3 {
  font-size: 4vw;
}

label,
input,
textarea,
legend,
select {
  font-size: 4vw;
}

body {
  background-color: #d4ecff;
}

/* footer */
footer {
  background-color: #8dd0f9;
  border-radius: 4px;
  text-align: center;
  margin-top: 7px;
}

/****** main *****/
main {
  flex-grow: 1;
  width: 100%;
  min-height: 76vh;
  margin: 0 auto;
}

section {
  background-color: #b0ddfe;
  border: 1px solid #6ec3f1;
  border-radius: 4px;
  margin-top: 10px;
}

/******* asideDiv ******/
.asideDiv {
  overflow: auto;
}

aside {
  font-style: italic;
  background-color: #8dd0f9;
  border: 1px solid yellow;
  border-radius: 4px;
  padding: 10px;
  margin: 10px;
}
.asideDivMainText {
  color: darkslategray;
  padding: 10px;
}

/********* button *********/

.btn {
  height: 35px;
  width: 140px;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: #ffffff;
  background: linear-gradient(to left, #004ff9c7, #fff94cab, #004ff9c7);
  border-radius: 4px;
  box-shadow: -4px 6px 4px #bcbba3;
  border: none;
  cursor: pointer;
  background-size: 200%;
  transition: 500ms;
}
.btn:hover {
  background-position: right;
}

.btn:active {
  box-shadow: 0px 2px #bcbba3;
  transform: translate(0, 2px);
}

/********  500   *******/
@media only screen and (min-width: 500px) {
  h1 {
    font-size: 3.9vw;
  }

  h2 {
    font-size: 3.6vw;
  }

  p,
  h3 {
    font-size: 3vw;
  }

  label,
  input,
  textarea,
  legend,
  select {
    font-size: 3vw;
  }

  aside {
    width: 30%;
    float: left;
    border: 1px solid yellow;
  }
}
/********   tablet   *******/
@media only screen and (min-width: 768px) {
  h1 {
    font-size: 2.6vw;
  }

  h2 {
    font-size: 2.4vw;
  }

  p,
  h3 {
    font-size: 2vw;
  }

  label,
  input,
  textarea,
  legend,
  select {
    font-size: 2vw;
  }

  .btn {
    height: 50px;
    width: 200px;
    font-size: 26px;
  }

  main {
    min-height: 83vh;
  }
}

/*********  desktop  ********/
/* @media only screen and (min-width: 1100px) {
  h1 {
    font-size: 2.6vw;
  }

  h2 {
    font-size: 2.4vw;
  }

  p,
  h3 {
    font-size: 2vw;
  }


} */

/*********  PC  ********/
@media only screen and (min-width: 1400px) {
  h1 {
    font-size: 2vw;
  }

  h2 {
    font-size: 1.8vw;
  }

  p,
  h3 {
    font-size: 1.6vw;
  }

  label,
  input,
  textarea,
  legend,
  select {
    font-size: 1.6vw;
  }
}