html,body{
  width: 100%;
  height: 100%;
  overflow: hidden;
}

body {
  padding: 0;
  margin: 0;

  background-image: url("../images/bg01.jpg");
  background-repeat: no-repeat;
  background-size: cover;

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

a {
  color: #3f3f3f;
  text-decoration: none;
}

a:link, a:visited, a:hover, a:active {
  color: #3f3f3f;
}

.container{
  width: calc(100% - 100px);
  height: calc(100% - 100px);
  padding: 10px;
  border-radius: 10px;
  background-color: rgba(255, 255, 255, 0.9);
}

.top_contents{
  width: 100%;
  height: 50px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

.main_contents{
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  width: 100%;
  height: calc(100% - 50px);
}


.title{
  background-image: url(../images/title_logo.png);
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
  position: relative;
  width: 180px;
  height: 50px;
  text-indent: 100%;
  white-space: nowrap;
  overflow: hidden;
}

.title a{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}


.menu ul{
  display: flex;
  justify-content: flex-end;
  padding: 0;
}

.menu li{
  list-style: none;
}

.menu li a{
  padding: 0 8px;
  line-height: 26px;
  font-style: italic;
  font-weight: bold;
  font-size: 16px;
  color: #000;
  
}


@media screen and (max-width: 550px){
  .title{
    background-position: left;
    width: 100%;
    height: 20px;
  }
  .top_contents{
    justify-content: center;
  }
  .menu ul{
    margin: 0;
  }
}

.one_tool {
  animation-name: fade-in4;
  animation-duration: 1s; 
  animation-timing-function: ease-out;
  animation-delay: 0.25s;
  animation-iteration-count: 1;
  opacity: 0;
  animation-direction: normal;
  animation-fill-mode: forwards;
}

@keyframes fade-in4 {
  0% {
    opacity: 0;
    transform: translate3d(40px, 0, 0);
  }
  100% {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}